Question

The height of a cone is 8 cm and its base radius is 6 cm. The curved surface area the cone is (Use $\pi$ = 3.14).

• A. 188.4${cm}^2$
• B. 198.4${cm}^2$
• C. 200.4${cm}^2$
• D. 180.2${cm}^2$

Answer 1

The correct option is A

188.4${cm}^2$

Here, h= 8cm and r= 6cm. So, from $l^2=h^2+r^2$, we have

$l^2=8^2+6^2$, l = 10 cm So, curved surface area = $\pi$rl

= $3.14\times 6\times 10{cm}^2=188.4{cm}^2$