If the volume of a right circular cone is 616 cm³ and its height is 12 cm, what is the radius of the base?
Show answer & explanation
Correct answer: D
Explanation
Volume of the cone V = 1/3 × πr²h
616 = 1/3 × 22/7 × r² × 12
616 = 88r²/7
r² = 616 × 7/88
r² = 49
r = 7 cm