Question

A vessel is in the form of a frustum of a cone. The area of the ends of the frustum cone are $122$ $c{m}^2$ and $205$ $c{m}^2$. If the curved surface area is $305$ $c{m}^2$. Find the total surface area.

• A. $613$ $c{m}^2$
• B. $632$ $c{m}^2$
• C. $620$ $c{m}^2$
• D. $640$ $c{m}^2$

Answer 1

Answer: (B)

$632$ $c{m}^2$

Total surface area = $\pi (R+r)s+\pi R^2+\pi r^2$
$=305+122+205$
$=632c{m}^2$