Question

A rectangle of sides $5cm$ and $7cm$ are rotated along the side $7cm$ Find the volume of solid so obtained.

Answer 1

When the rectangle is rotated the so obtained solid is cylinder

With height $7cm$ and radius $5cm$

Volume of cylinder is $\pi r^{2}h\frac{22}{7}\times 5\times 5\times 725\times 22=550c{m}^3$