14. Five marks exercise problem III

A right angled triangle $PQR$ where $\angle Q = 90^\circ$ is rotated about $QR$ and $PQ$. If $QR = 16 \ cm$ and $PR = 20 \ cm$, compare the curved surface areas of the right circular cones so formed by the triangle.

 

 

Curved surface area of a cone rotated about $QR$ $=$ 1005.71754.29705.781184.03 $cm^2$

 

Curved surface area of a cone rotated about $PQ$ $=$  754.291184.03705.781005.71 $cm^2$