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The surface area of a sphere is
πr2
2πr2
3πr2
4πr2
The surface area of a sphere is 4πr2.
The area covered by a road roller is 35 m in 10 revolutions. Find the circumference of the road roller.
35 m
3.5 m
350 m
3.5 cm
Circumference of a road roller × 10 = 35 Circumference of the road roller = 3.5 m.
The radius of the base of a cone is 3 cm and the slant height of the cone is 5 cm. Find the height of the cone.
1 cm
2 cm
4 cm
8 cm
Using the Pythagorean triplet (3, 4, 5), we can say that the height of the cone is 4 cm.
If the lengths of the sides of a cube are doubled, then the surface area of the new cube is _____ the original.
Same as
Twice
Thrice
Four times
Surface area of a cube is 6s2.
New side is 2s.
New surface area of the cube = 6(2s)2 = 4 × 6s2
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