Q70 of 227 Page 917

The total surface area of a hemisphere of radius 7 cm is

Given: Radius of the hemisphere: 7cm .

TSA of the hemisphere is given by: 3πr²

Let S be the TSA of the hemisphere.

∴ S = 3πr²

⇒ S = 3 × π × (7)² = 147π cm²

∴ TSA of the hemisphere is 147π cm²

The volume of a hemisphere is 19404 cm³. The total surface area of the hemisphere is

The surface area of a sphere is 154 cm². The volume of the sphere is

The circular ends of a bucket are of radii 35 cm and 14 cm and the height of the bucket is 40 cm. Its volume is

If the radii of the end of a bucket are 5 cm and 15 cm and it is 24 cm high then its surface area is (use π = 3.14)