Question

A figure is formed by revolving a rectangular sheet of dimensions 7cm x 4cm about its length. What is the volume of figure thus formed?

Answer 1

Answer:

vol=πr^2h

r=4, h=7

πr 2h=22X4^2 x 7/7=352cm3

Answer 2

Answer:

Radius = 4

height = 7

volume =

$\pi \: r {}^{2} h \\ \\ = \frac{22}{7} \times (4) {}^{2} \times 7 \\ \\ = \frac{22}{7} \times 16 \times 7$

352cm^2