Question

Radii of the circular faces of a frustum of a cone are $14cm$ and $8cm$. If slant height of the frustum is 1$0cm$ then find the curved surface area of the frustum. $(\pi =3.14)$

Answer 1

Given: Radii are $8cm$ & $14cm$ slant height $=10cm$

Also, we know that

curved surface area of frustum of cone is

$=\pi l(r_1+r_2)$

Here $l=10cm,r_1=8cm,r_2=14cm.$

so, CSA $=\pi \times 10(8+14)c{m}^2$

$=10\pi \left(22\right)c{m}^2$

$=220\pi c{m}^2$