Question

Radius and slant height of a solid right circular cone are $35cm$ and $37cm$ respectively. Find the curved surface area and total surface area of the cone. (Take $\pi =\frac{22}{7})$

Answer 1

Let $r$ and $l$ be the radius and the slant height of the solid right circular cone respectively.
$r=35cm,l=37cm$
Curved Surface area, $CSA=\pi rl=\pi \left(35\right)\left(37\right)$
$CSA=4070sq.cm$
Total surface area, $TSA=\pi r(l+r)$
$=\frac{22}{7}\times 35\times (37+35)$
Thus, $TSA=7920sq.cm$