Question

Find the curved surface area of frustum cone radii 0.5 and 5.2 m and a slant height 10 m. (Use $\pi$ = 3.14).

• A. 176.98 $m^2$
• B. 178.98 $m^2$
• C. 177.98 $m^2$
• D. 179.98 $m^2$

Answer 1

The correct option is B 178.98 $m^2$

Curved surface area = $\pi$(R + r)s

= $\pi (0.5+5.2)\times 10$

= $\pi \left(5.7\right)\times 10$

= $3.14\times \left(5.7\right)$

= 178.98 $m^2$