Question

A right angled triangle of sides 20 cm, 21 cm and 29 cm is made to rotate on the longest side. Find the volume of cone so formed.

Answer 1

plz tell if right or wrong....

Answer 2

Hence the  volume of cone is 12152 $cm^3$.

Step-by-step explanation:

Given:

A right angled triangle has sides 20 cm, 21 cm and 29 cm.

It is made to rotate on the longest side = 29 cm = h = height.

Radius = 20 cm

Volume = $\frac{1}{3} \pi r^2h$

             = $\frac{1}{3}\times\frac{22}{7} \times 20^2\times 29$

             = $\frac{22 \times 20\times20\times29}{3\times7}$

             = $\frac{255200}{21}$

            = 12152 $cm^3$

Hence the  volume of cone is 12152 $cm^3$.