A right circular solid cone of radius 3.2cm and height 7.2cm is melted and recast into a right circular cylinder of height 9.6cm. What is the diameter of the base of the cylinder ?
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 ie 3.2cm.
(1/3) × (3.2)² × 7.2 = [(d)² / 4] × 9.6
d² = (3.2)²
d = 3.2