Question

Note Use $\mathrm{\pi }=\frac{22}{7}$, unless stated otherwise.
Find the curved surface area of a cone with base radius 5.25 cm and slant height 10 cm.

Answer 1

Radius of the base, r = 5.25 cm

Slant height, l = 10 cm

∴ Curved surface area of the cone = $\mathrm{\pi }rl=\frac{22}{7}\times 5.25\times 10$ = 165 cm²

Thus, the curved surface area of the cone is 165 cm².