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NCERT Class 9 Mathematics MCQ Surface Areas And Volumes with Answers
Question : If the lateral area of a cylinder of radius 13 cm and height 21 cm is to be covered with paper, then the area of the paper required is
(a) 1588 cm ²
(b) 3210 cm ²
(c) 2345 cm ²
(d) 1716 cm ²
Answer :(d) 1716 cm ² Show Answer :
Question : The volume of a sphere is 38808 cu.cm. The curved surface area of the sphere (in cm2) is :
(a) 5544
(b) 1386
(c) 8316
(d) 4158
Answer :(a) 5544Show Answer :
Question : A right circular cone has an altitude of 40 cm and a diameter of 60 cm. The slant height of the cone is
(a) 25 cm
(b) 100 cm
(c) 75 cm
(d) 50 cm
Answer :(d) 50 cmShow Answer :
Question : A conical tent is 15 m high and the radius of its base is 20 m. The cost of the canvas required to make the tent at the rate of Rs 7 per m2 is
(a) Rs 10000
(b) Rs 12000
(c) Rs 11000
(d) Rs 9000
Answer :(c) Rs 11000Show Answer :
Question : The ratio of the radii of two spheres whose volumes are in the ratio 64 : 27 is
(a) it is 8 : 3.
(b) it is 16 : 9.
(c) it is 10 : 7.
(d) it is 4 : 3.
Answer :(d) it is 4 : 3.Show Answer :
Question : The formula to find the surface area of a cuboid of length (l), breadth (b) and height (h) is:
(a) lb+bh+hl
(b) 2(lb+bh+hl)
(c) 2(lbh)
(d) lbh/2
Answer : bShow Answer :
Question : The surface area of a cube whose edge equals to 3cm is:
(a) 62 sq.cm
(b) 30 sq.cm
(c) 54 sq.cm
(d) 90 sq.cm
Answer : cShow Answer :
Explanation: Given, a = 3 cm
Surface area of cube = 6a2
SA = 6 x 3 x 3 = 54 sq.cm
Question : The surface area of cuboid-shaped box having length=80 cm, breadth=40cm and height=20cm is:
(a) 11200 sq.cm
(b) 13000 sq.cm
(c) 13400 sq.cm
(d) 12000 sq.cm
Answer : a = 2[3200 + 800 + 1600]
= 2 × 5600 = 11200 sq.cm.Show Answer :
Explanation: surface area of the box = 2(lb + bh + hl)
S.A. = 2[(80 × 40) + (40 × 20) + (20 × 80)]
Question : The volume of a hemisphere whose radius is r is:
(a) 4/3 πr3
(b) 4πr3
(c) 2πr3
(d) ⅔ π r3
Answer : dShow Answer :
Question : If the radius of a cylinder is 4cm and height is 10cm, then the total surface area of a cylinder is:
(a) 440 sq.cm
(b) 352 sq.cm.
(c) 400 sq.cm
(d) 412 sq.cm
Answer : bShow Answer :
Explanation: Total Surface Area of a Cylinder = 2πr(r + h)
TSA = 2 x 22/7 x 4(4 + 10)
= (2x22x4x14)/7
= (2x22x4x2)
= 352 sq.cm
Question : The curved surface area of a right circular cylinder of height 14 cm is 88 cm2. The diameter of the base is:
(a) 2 cm
(b) 3cm
(c) 4cm
(d) 6cm
Answer : aShow Answer :
Explanation: Curved surface area of cylinder = 88 sq.cm
Height = 14 cm
2πrh = 88
r = 88/2πh
r=1 cm
Diameter = 2r = 2cm
Question : The Curved surface area of a right circular cylinder is 4.4 sq.cm. The radius of the base is 0.7 cm. The height of the cylinder will be:
(a) 2 cm
(b) 3 cm
(c) 1 cm
(d) 1.5 cm
Answer : cShow Answer :
Explanation: Curved surface area of cylinder = 2πrh
2πrh = 4.4
h = 4.4/(2π x 0.7)
h = 1 cm
Question :The area surrounded by a conical tent is 4526 m2. If the cost of canvas is Rs. 17 per square meter, then find the total cost of canvas.
(a) ₹52100
(b) ₹76942
(c) ₹65000
(d) ₹85246
Answer : (b) ₹76942Show Answer :
Question :The surface area of cuboid-shaped box having length=80 cm, breadth=40cm and height=20cm is:
(a) 11200 sq.cm
(b) 13000 sq.cm
(c) 13400 sq.cm
(d) 12000 sq.cm
Answer : (a) 11200 sq.cmShow Answer :
Question :The volume of a sphere is 38808 cu.cm. The curved surface area of the sphere (in cm2) is :
(a) 5544
(b) 1386
(c) 8316
(d) 4158
Answer : (a) 5544Show Answer :
Question :The height of a right circular cone of radius 3.5 cm and volume 77 cm3 is
(a) 9 cm
(b) 11 cm
(c) 4 cm
(d) 6 cm
Answer : (d) 6 cmShow Answer :
Question :he ratio of the radii of two spheres whose volumes are in the ratio 64 : 27 is
(a) it is 8 : 3.
(b) it is 16 : 9.
(c) it is 10 : 7.
(d) it is 4 : 3.
Answer : (d) it is 4 : 3.Show Answer :
Question :If the diameter of a cylinder is 28 cm and its height is 20 cm, then total surface area (in cm2) is :
(a) 2993
(b) 2992
(c) 2292
(d) 2229
Answer : (b) 2992Show Answer :
Question :The radius of two similar right circular cones are 2 cm and 6 cm. The ratio of their volumes is
(a) 1 : 3
(b) 1 : 9
(c) 9 : 1
(d) 1 : 27
Answer : (d) 1 : 27Show Answer :
Question :A rectangular sand box is 5 m wide and 2 m long. How many cubic metres of sand are needed to fill the box upto a depth of 10 cm ?
(a) 1
(b) 10
(c) 100
(d) 1000
Answer : (a) 1Show Answer :
Question :The cost of cementing the inner curved surface of a 14 m deep well of radius 2 m at the rate of ₹2 per m2 is
(a) ₹352.
(b) ₹176.
(c) ₹56.
(d) ₹112.
Answer : (a) ₹352.Show Answer :
Question :The slant height of a cone with radius 15 cm and height 20 cm is
(a) 21 cm
(b) 20 cm
(c) 25 cm
(d) 15 cm
Answer : (c) 25 cmShow Answer :
Question :A hemispherical bowl is made of steel 0.25 cm thick. If the inner radius of the bowl is 3.25 cm, then the outer curved surface area of the bowl is
(a) 154 cm2.
(b) 77 cm2.
(c) 115.5 cm2.
(d) 38.5 cm2.
Answer : (b) 77 cm2.Show Answer :
Question :A conical tent is 15 m high and the radius of its base is 20 m. The cost of the canvas required to make the tent at the rate of ₹7 per m2 is
(a) ₹10000
(b) ₹12000
(c) ₹11000
(d) ₹9000
Answer : (c) ₹11000Show Answer :
Question :The curved surface area of a right circular cylinder of height 14 cm is 88 cm2. The diameter of the base is:
(a) 2 cm
(b) 3 cm
(c) 4 cm
(d) 6 cm
Answer : (a) 2 cmShow Answer :
Question : The length of the longest rod that can fit in a cubical vessel of side 10 cm, is
(a) 10 cm
(b) 10√2 cm
(c) 10√3 cm
(d) 20 cm
Answer :(c) 10√3 cmShow Answer :
Question : The surface area of a cube whose edge equals to 3cm is:
(a) 62 cm ²
(b) 30 cm ²
(c) 54 cm ²
(d) 90 cm ²
Answer :(c) 54 cm ² Show Answer :
Question : Length of diagonals of a cube of side a cm is
(a) √2a cm
(b) √3a cm
(c) √3a√ cm
(d) 1 cm
Answer :(b) √3a cmShow Answer :
Question : The area surrounded by a conical tent is 4526 m2. If the cost of canvas is Rs. 17 per square meter, then find the total cost of canvas.
(a) ₹52100
(b) ₹76942
(c) ₹65000
(d) ₹85246
Answer :(b) ₹76942Show Answer :
Question : If the diameter of the base of a cylindrical pillar is 4 m and its height is 21 m, then the cost of construction of the pillar at Rs. 1.50 per cubic metre is:
(a) Rs. 396
(b) Rs. 400
(c) Rs. 410
(d) Rs. 420
Answer :(a) Rs. 396Show Answer :
Question : The volume of hemisphere whose radius is r, is:
(a) 4/3 πr³
(b) 4πr³
(c) 2πr³
(d) ⅔ π r³
Answer :(d) ⅔ π r³Show Answer :
Question : Volume of hollow cylinder
(a) π(R² – r²)h
(b) πR²h
(c) πr²h
(d) πr²(h1 – h1)
Answer :(a) π(R² – r²)hShow Answer :
Question : If slant height of the cone is 21cm and the diameter of the base is 24 cm. The total surface area of a cone is:
(a) 1200.77 sq.cm
(b) 1177 sq.cm
(c) 1222.77 sq.cm
(d) 1244.57 sq.cm
Answer : dShow Answer :
Explanation: Total surface area = πr(l + r)
r = 24/2 = 12 cm
l = 21 cm
TSA = π(12)(21 + 12) = 1244.57 sq.cm
Question : The surface area of a sphere of radius 14 cm is:
(a) 1386 sq.cm
(b) 1400 sq.cm
(c) 2464 sq.cm
(d) 2000 sq.cm
Answer : cShow Answer :
Explanation: Radius of sphere, r = 14 cm
Surface area = 4πr2
= 4 x 22/7 x (14)2 = 2464 sq.cm.
Question : The radius of a sphere is 2r, then its volume will be
(a) (4/3) πr3
(b) 4πr3
(c) (8/3) πr3
(d) (32/3) πr3
Answer :dShow Answer :
Explanation:
Given : r=2r
The volume of sphere = (4/3)πr3 = (4/3)π(2r)3
V = (4/3)π(8r3) = (32/3)πr3.
Question : The radius of a hemispherical balloon increases from 6 cm to 12 cm as air is being pumped into it. The ratio of the surface areas of the balloon in the two cases is
(a) 1:4
(b) 1:3
(c) 2:3
(d) 2:1
Answer :aShow Answer :
Explanation:
We know that the total surface area of the hemisphere = 3πr2 square units.
If r= 6cm, then TSA = 3π(6)2 = 108π
If r = 12 cm, then TSA = 3π(12)2= 432π
Then the ratio = (108π)/(432π)
Ratio = ¼, which is equal to 1:4.
Question : The total surface area of a cube is 96 cm2. The volume of the cube is:
(a) 8 cm3
(b) 512 cm3
(c) 64 cm3
(d) 27 cm3
Answer :cShow Answer :
Explanation:
We know that the TSA of the cone = 6a2.
6a2 = 96 cm2
a2 = 96/6 = 16
a =4 cm
The volume of cone = a3 cubic units
V = 43 = 64cm3.
Question : The length of the longest pole that can be put in a room of dimensions (10 m × 10 m × 5m) is
(a) 15m
(b) 16m
(c) 10m
(d) 12m
Answer :aShow Answer :
Explanation:
Given: l=10m, b= 10m, h= 5m
The length of the longest pole = √[102+102+52]
= √(100+100+25) = √225 = 15 m.
Question : A cone is 8.4 cm high and the radius of its base is 2.1 cm. It is melted and recast into a sphere. The radius of the sphere is
(a) 4.2 cm
(b) 2.1 cm
(c) 2. 4 cm
(d) 1.6 cm
Answer :bShow Answer :
Explanation:
Given that the height of cone = 8.4 cm
Radius of cone = 2.1 cm
Also, given that the volume of cone = volume of a sphere
(⅓)πr2h = (4/3)πr3
(⅓)π(2.1)2(8.4) = (4/3)πr3
37.044= 4r3
r3= 37.044/4
r3= 9.261
r = 2.1
Therefore, the radius of the sphere is 2.1 cm.
Question : The number of planks of dimensions (4 m × 50 cm × 20 cm) that can be stored in a pit that is 16 m long, 12m wide and 4 m deep is
(a) 1900
(b) 1920
(c) 1800
(d) 1840
Answer :bShow Answer :
Explanation:
Volume of Plank = 400 cm×50cm×20cm=400000cm3
Volume of pits = 1600cm×1200cm×400cm = 768000000cm3
Number of planks = Volume of planks/Volume of pits
= 768000000/400000
Hence, the number of pits = 1920
Question : In a cylinder, the radius is doubled and height is halved, the curved surface area will be
(a) Halved
(b) Doubled
(c) Same
(d) Four times
Answer : cShow Answer :
Explanation:
We know that the curved surface area of a cylinder is 2πrh
Given that, r = 2R, h= H/2
Hence, the CSA of new cylinder = 2π(2R)(H/2) = 2πRH
Therefore, the answer is “Same”.
Question : The internal and external radii of a hemispherical container are r1 and r2 respectively. The curved surface area of the container is
(a) π( r12 + r22 )
(b) 2π( r12 +r22 )
(c) 2π( r22 – r12 )
(d) π( r22 – r12)
Answer :BShow Answer :
Question : The altitude of a circular cylinder is increased three times and the base area is decreased to one-ninth of its value. The ratio of volume of the cylinder is
(a) 2 : 3
(b) 1 : 2
(c) 3 : 1
(d) 2 : 1
Answer :CShow Answer :
Question : A cylindrical vessel 60 cm in diameter is partially filled with water. A sphere of 60 cm in diameter is gently dropped into the vessel. To what further height will water rise in the cylinder?
(a) 15 cm
(b) 30 cm
(c) 40 cm
(d) 25 cm
Answer :CShow Answer :
Question : The radius of a spherical balloon increases from 7 cm to 14 cm as air is being pumped into it. The ratio of the surface areas of the balloon in the two cases is
(a) 1 : 4
(b) 1 : 3
(c) 2 : 3
(d) 2 : 1
Answer :AShow Answer :
Question : If 6 cubes of side 2 cm are joined, then find the total surface area (in cm2) of resulting cuboid.
(a) 144
(b) 48
(c) 24
(d) 104
Answer 😀Show Answer :
Question : The largest sphere is cut off from a cube of side 5 cm. The volume of the sphere will be
(a) 27π cm3
(b) 30π cm3
(c) 108π cm3
(d) 125π/6 cm3
Answer 😀Show Answer :
Question : Number of pair of surfaces of same area in a cuboid are
(a) 6
(b) 4
(c) 2
(d) 3
Answer 😀Show Answer :
Question : The total surface area of a cone of radius ‘2r’ and slant height ‘l/2’ is
(a) 2πr (l + r)
(b) πr ( l + r/4)
(c) πr (4r + l)
(d) 2πr
Answer :CShow Answer :
Question : The lateral surface area of a cube of side a units is _______ sq. units.
(a) 4a2
(b) 6a2
(c) a2
(d) a3
Answer :AShow Answer :
Question : The lateral surface area of a cube is 256 m2. The volume of the cube is
(a) 512 m3
(b) 64 m3
(c) 216 m3
(d) 256 m3
Answer :aShow Answer :
Explanation:
The lateral surface area of cube = 4a2
4a2= 256
a2 = 256/4 =64
a = 8 m
Hence, the volume of cube = a3 cube units
V = 83 = 512 m3.
Question : The total surface area of a cone whose radius is r/2 and slant height 2l is
(a) 2πr(l+r)
(b) πr(l+(r/4))
(c) πr(l+r)
(d) 2πrl
Answer :bShow Answer :
Explanation:
The total surface area of cone = πr(l+r) square units.
If r = r/2 and l= 2l, then the TSA of cone becomes,
TSA of cone = π(r/2)[(2l+(2/r)]
=π[(rl)+(r2/4)]
TSA of new cone =πr[l+(r/4)]
Question : The radii of two cylinders are in the ratio of 2:3 and their heights are in the ratio of 5:3. The ratio of their volumes is:
(a) 10: 17
(b) 20: 27
(c) 17: 27
(d) 20: 37
Answer :bShow Answer :
Explanation:
Given that, the radii of two cylinders are in the ratio of 2:3
Hence, r1= 2r, r2 = 3r
Also, given that, the height of two cylinders are in the ratio 5:3.
Hence, h1 = 5h, h2 = 3h
The ratio of the volume of two cylinders = V1/V2
= πr12h1/πr22h2
= [(2r)2(5h)]/[(3r)2(3h)]
Ratio of their volumes =(20r2h)/(27r2h) = 20/27 = 20: 27.
Question : Volume of a hemisphere is 19404 cubic cm. The total surface area is
(a) 2772 sq. cm
(b) 4158 sq. cm
(c) 5544 sq. cm
(d) 1386 sq. cm
Answer :BShow Answer :
Question : If each edge of a cuboid of total surface area S is doubled, then total surface area of the resulting cuboid is
(a) 2S
(b) 4S
(c) 6S
(d) 8S
Answer :BShow Answer :
Question : The ratio of the radii of two spheres is 4 : 5. The ratio of their surface areas is
(a) 4 : 5
(b) 2 : 5
(c) 5 : 4
(d) 16 : 25
Answer 😀Show Answer :
Question : If the radius and height of a cone are both increased by 10%, then the volume of the cone is approximately increased by
(a) 10%
(b) 21%
(c) 33%
(d) 100%
Answer :CShow Answer :
Question : The altitude of a circular cylinder is increased by six times and the base area is decreased by one-ninth of its value. The factor by which the lateral surface area of the cylinder increases, is
(a) 2/3
(b) 1/2
(c) 3/2
(d) 2
Answer 😀Show Answer :
Question : A cuboid is 12 cm long, 9 cm broad and 8 cm high. Its total surface area is
(a) 864 cm2
(b) 552 cm2
(c) 432 cm2
(d) 276 cm2
Answer :BShow Answer :
Question : The diameters of two cones are equal. If their slant heights are in the ratio 5 : 4, then the ratio of their curved surface areas is
(a) 4 : 5
(b) 25 : 16
(c) 16 : 25
(d) 5 : 4
Answer 😀Show Answer :
Question : The heights of two cylinders are in the ratio 5 : 3 and their volumes are in the ratio 20 : 27. Then the ratio of their radii is
(a) 25 : 9
(b) 5 : 3
(c) 4 : 9
(d) 2 : 3
Answer 😀Show Answer :
Question : The curved surface area of a right circular cylinder is 1520 cm2 and diameter of its base is 30 cm. Then the volume of the cylinder is
(a) 11400 cm3
(b) 11560 cm3
(c) 12700 cm3
(d) 11600 cm3
Answer :AShow Answer :
Question : The surface area of a cube whose side is 5 cm is
(a) 125 cm2
(b) 28 cm2
(c) 100 cm2
(d) 150 cm2
Answer 😀Show Answer :
Question : The total surface area of a cube is 216 cm2 , its each side is
(a) 4 cm
(b) 5 cm
(c) 6 cm
(d) 7 cm
Answer :CShow Answer :
Question :If a spherical balloon grows to twice its radius when inflated, then the ratio of the volume of the inflated balloon to the original balloon is
(a) it is 8 : 1
(b) it is 4 : 1
(c) it is 5 : 1
(d) it is 6 : 1
Answer : (a) it is 8 : 1Show Answer :
Question :The length of the longest rod that can fit in a cubical vessel of side 10 cm, is
(a) 10 cm
(b) 10√2 cm
(c) 10√3 cm
(d) 20 cm
Answer : (c) 10√3 cmShow Answer :
Question :A right circular cone has an altitude of 40 cm and a diameter of 60 cm. The slant height of the cone is
(a) 25 cm
(b) 100 cm
(c) 75 cm
(d) 50 cm
Answer : (d) 50 cmShow Answer :
Question :If the diameter of the base of a cylindrical pillar is 4 m and its height is 21 m, then the cost of construction of the pillar at Rs. 1.50 per cubic metre is:
(a) Rs. 396
(b) Rs. 400
(c) Rs. 410
(d) Rs. 420
Answer : (a) Rs. 396Show Answer :
Question :The height of a right circular cone of radius 5 cm and slant height 13 cm is
(a) 8 cm
(b) 14 cm
(c) 6 cm
(d) 12 cm
Answer : (d) 12 cmShow Answer :
Question :The curved surface area of a right circular cone whose slant height is 14 cm and base radius is 21 cm is
(a) 308 cm2
(b) 924 cm2
(c) 232 cm2
(d) 446 cm2
Answer : (b) 924 cm2Show Answer :
Question :The perimeter of one face of a cube is 40 cm. The volume of the cube (in cm3) is :
(a) 1600
(b) 1000
(c) 800
(d) 160
Answer : (b) 1000Show Answer :
Question :The volume of the cylinder whose height is 14 cm and diameter of base 4 cm is:
(a) 176 cm3
(b) 196 cm3
(c) 276 cm3
(d) 352 cm3
Answer : (a) 176 cm3Show Answer :
Question :A beam 9 m long, 40 cm wide and 20 cm deep is made up of iron which weighs 50 kg per cubic metre. The weight of the beam is :
(a) 27 kg
(b) 36 kg
(c) 48 kg
(d) 56 kg
Answer : (b) 36 kgShow Answer :
Question : A hemispherical bowl is made of steel 0.25 cm thick. If the inner radius of the bowl is 3.25 cm, then the outer curved surface area of the bowl is
(a) 154 cm²
(b) 77 cm²
(c) 115.5 cm²
(d) 38.5 cm²
Answer :(b) 77 cm²Show Answer :
Question : The number of litres that a cuboidal water tank of dimensions 6m×5m×4.5m can hold is
(a) 270000 l.
(b) 135000 l.
(c) 135 l.
(d) 270 l.
Answer :(b) 135000 l.Show Answer :
Question : The curved surface area of a right circular cone whose slant height is 14 cm and base radius is 21 cm is
(a) 308 cm²
(b) 924 cm²
(c) 232 cm²
(d) 446 cm²
Answer :(b) 924 cm²Show Answer :
Question : The Curved surface area of a right circular cylinder is 4.4 sq.cm. The radius of the base is 0.7 cm. The height of cylinder will be:
(a) 2 cm
(b) 3 cm
(c) 1 cm
(d). 1.5 cm
Answer :(c) 1 cmShow Answer :
Question : In a cylinder, radius is doubled and height is halved, curved surface area will be
(a) halved
(b) doubled
(c) same
(d) four time
Answer :(c) sameShow Answer :
Question : The cost of cementing the inner curved surface of a 14 m deep well of radius 2 m at the rate of ₹2 per m2 is
(a) ₹352.
(b) ₹176.
(c) ₹56.
(d) ₹112.
Answer :(a) ₹352.Show Answer :
Question : The curved surface area of right circular cylinder of height 14 cm is 88 cm2. The diameter of the base of the cylinder is:
(a) 3 cm
(b) 2 cm
(c) 4 cm
(d) 1 cm
Answer :(b) 2 cmShow Answer :
Question : The volume of the cylinder whose height is 14 cm and diameter of base 4 cm is:
(a) 176 cm³
(b) 196 cm³
(c) 276 cm³
(d) 352 cm³
Answer :(a) 176 cm³Show Answer :
Question : The surface area of a sphere of radius 14 cm is:
(a) 1386 cm²
(b) 1400 cm²
(c) 2464 cm²
(d) 2000 cm²
Answer :(c) 2464 cm²Show Answer :
Question : The length of the longest pole that can be put in a room of dimension (10 m × 10 m × 5 m) is
(a) 15 m
(b) 16 m
(c) 10 m
(d) 12 m
Answer :(a) 15 mShow Answer :
Question : A rectangular sand box is 5 m wide and 2 m long. How many cubic metres of sand are needed to fill the box upto a depth of 10 cm ?
(a) 1
(b) 10
(c) 100
(d) 1000
Answer :(a) 1Show Answer :
Question : The radius of two similar right circular cylinders are 4 cm and 6cm. The ratio of their altitudes is
(a) 4 : 9
(b) 2 : 9
(c) 2 : 3
(d) 4 : 3
Answer :(c) 2 : 3Show Answer :
Question : The area surrounded by a conical tent is 4526 m2. If the cost of canvas is Rs. 17 per square meter, then find the total cost of canvas.
(a) ₹52100
(b) ₹76942
(c) ₹65000
(d) ₹85246
Answer :(b) ₹76942Show Answer :
Question : The radii of two cylinders are in the ratio of 2 : 3 and their heights are in the ratio of 5 : 3. The ratio of their volumes is
(a) 10 : 17
(b) 20 : 27
(c) 17 : 27
(d) 20 : 37
Answer :(b) 20 : 27Show Answer :
Question : The radius of two similar right circular cones are 2 cm and 6 cm. The ratio of their volumes is
(a) 1 : 3
(b) 1 : 9
(c) 9 : 1
(d) 1 : 27
Answer :(d) 1 : 27Show Answer :
Question : The diameter of the base of a cone is 10.5 cm, and its slant height is 10 cm. The curved surface area is:
(a) 150 sq.cm
(b) 165 sq.cm
(c) 177 sq.cm
(d) 180 sq.cm
Answer : bShow Answer :
Explanation: Diameter = 10.5, Radius = 10.5/2
Slant height, l = 10cm
Curved surface area of cone = πrl = π(5.25)(10)
CSA = 165 sq.cm
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