Question

Find the curved surface area of a frustum cone whose larger and smaller radius is 12 and 8 cm. The slant height is 24 cm. (Use $\pi$ = 3.14)

• A. 1,507.2 cm${}^2$
• B. 1,407.2 cm${}^2$
• C. 1,307.2 cm${}^2$
• D. 1,207.2 cm${}^2$

Answer 1

The correct option is A 1,507.2 cm${}^2$

Curved surface area of a frustum cone = $\pi$(r + R)s $\Rightarrow$ ?

= 3.14 $\times$ (8 + 12) $\times$ 24

= 3.14 x (20) $\times$ 24

Curved surface area of a frustum cone = 1,507.2 cm${}^2$