Question bank / Area and volume

Math · Geometry and TrigonometryMedium

A right circular cone has a volume of 96π96\pi cubic inches and a base radius of 66 inches. What is the height, in inches, of the cone?

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Answer: 8

The volume of a cone is V=13πr2hV = \frac{1}{3}\pi r^2 h. Substituting gives 96π=13π(36)h=12πh96\pi = \frac{1}{3}\pi(36)h = 12\pi h. Dividing both sides by 12π12\pi gives h=8h = 8.

Leaving out the 13\frac{1}{3} gives 36πh=96π36\pi h = 96\pi, or h=83h = \frac{8}{3}, which is the height of a cylinder with this volume and radius.

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