Q1 of 67 Page 195

Total surface area of a cube is 486 cm2. The side of the cube is:

Let the side of cube be a


Total surface area of cube = 6a2


⇒ 6a2 = 486


⇒ a2 = 81


⇒ a = 9 cm

More from this chapter

All 67 →
13

The diameter of a sphere is 0.7 cm. By putting 3000 such spheres in a tank full of water, the tank is emptied completely. Find the volume of water that overflows.

 14

The outer and inner diameter of a hollow hemi–spherical vessel are 43 cm and 42 cm. Find the cost of colouring the vessel at 7 paise per square cm.

 2

The length, breadth and height of a cuboid are 9 m, 2 m and 1 m respectively. The lateral surface area of the cuboid is:

 3

The diameter of a sphere is 6 cm. Its volume is—