Question

If the radii of the circular ends of a conical glass are $15$ and $9$ cm whose slant height is 35 cm. Find the surface area of the glass? (Use $\pi$ = $3$)

• A. $2420$ $c{m}^2$
• B. $2520$ $c{m}^2$
• C. $2220$ $c{m}^2$
• D. $2120$ $c{m}^2$

Answer 1

Answer: (B)

$2520$ $c{m}^2$

Curved surface area = $\pi (R+r)l$
= $3\times (15+9)\times 35$
= $3\times 24\times 35$
$=2520$ $c{m}^2$