Question

A right triangle with sides $6$ cm, $8$ cm and $10$ cm is revolved about the side $8$ cm. Find the curved surface of the solid so formed.

• A. $188.57$
• B. $190.8$
• C. $185.3$
• D. $181.56$

Answer 1

The correct option is A $188.57$

AFTER DRAWING THE FIGURE WE COME TO KNOW THAT A CONE IF FORMED WHOSE

l = 10 cm , h = 8 cm , r = 6 cm

Curved surface of the solid (CONE )$=\pi rl$

$A=\pi rl=22/7\ast 10\ast 6=188.57c{m}^2$