Question

Diameter of the base of a cone is $10.5cm$ and its slant height is $10cm$. Find its curved surface area.

Answer 1

STEP 1 : Given

Slant height of a the $=10cm$

Diameter of the base of a cone $=10.5cm$

Radius of the base of a cone $=\frac{10.5}{2}cm$

STEP 2 : Finding the curved surface area of the cone

Curved surface area of the cone $=\mathrm{\pi rl}$

Curved surface area of the cone $=\frac{22}{7}\times \frac{10.5}{2}\times 10$

Curved surface area of the cone $=165c{m}^2$

Hence, the curved surface area of the cone is $165c{m}^2$