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).