Question

The radius (in cm) of the largest right circular cone that can be cut out from a cube of edge 4.2 cm is

Options

• A. 4.2

• B. 2.1

• C. 8.4

• D. 1.05

Answer 1

The height and diameter of the base of the largest right circular cone that can be cut out from a cube are equal to the edge of the cube.

Let the radius of the cone be r cm.

∴ 2r = 4.2 cm

`rArr r=4.2/2 cm =2.1 cm`

The correct answer is B