Choose the correct answer of the following:
Question:

Choose the correct answer of the following:

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

(a) 2.1                         (b) 4.2                         (c) 8.4                         (d) 1.05

Solution:

Since, the diameter of the base of the largest cone that can be cut out from the cube = Edge of the cube = 4.2 cm

So, the radius of the base of the largest cone $=\frac{4.2}{2}=2.1 \mathrm{~cm}$

Hence, the correct answer is option (a).