Question

If the slant height and the base radius of a cone are $10$ cm and $8$ cm respectively, then find
(i) curved surface area and
(ii) total surface area. [Take $\pi =3.14$]

Answer 1

Given: Slant height of cone $=10cm$
Radius of the base of cone $=8cm$

(i) CSA $=\pi rl$

$=3.14\times 8\times 10$

$=251.2c{m}^2$

(ii) TSA $=\pi r(l+r)$

$=3.4\times 8(10+8)$

$=25.12\left(18\right)$

$=452.16c{m}^2$