Question

The curved surface area of a right circular cone of height 15 cm and base diameter 16 cm is

पर्याय

• 60π cm²

• 68π cm²

• 120π cm²

• 136π cm²

Answer 1

136 cm²

Explanation;

Hint:

Here, h = 15 cm, r = 8 cm

l = `sqrt("h"^2 + "r"^2)`

= `sqrt(15^2 + 8^2)`

= `sqrt(225 + 64)`

= `sqrt(289)`

= 17

C.S.A of a cone

= πrl sq.units.

= π × 8 × 17

= 136π cm²