Question

A right triangle with sides 3,4 and 5 cms is first rotated about the side 4 cm to form a solid and then rotated about the side 3 cm to obtain another solid . The ratios of volumes of the 2 solids obtained is 1:1.

• A. True
• B. False

Answer 1

The correct option is B

False

Consider the above figures.

Volume of first figure = $\frac{1}{3}\pi 3^2\times 4$

Volume of second figure = $\frac{1}{3}\pi 4^2\times 3$

Ratios of volumes = 3: 4

Hence, false