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Geometry and Trigonometry Difficulty: Hard

A right circular cone has a height of 22 centimeters cm and a base with a diameter of 6 cm. The volume of this cone is nπ cm3. What is the value of n ?

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Explanation

The correct answer is 66 . It’s given that the right circular cone has a height of 22 centimeters cm and a base with a diameter of 6 cm. Since the diameter of the base of the cone is 6 cm, the radius of the base is 3 cm. The volume V , in cm3, of a right circular cone can be found using the formula V=13πr2h, where h is the height, in cm, and r is the radius, in cm, of the base of the cone. Substituting 22 for h and 3 for r in this formula yields V=13π3222, or V=66π. Therefore, the volume of the cone is 66π cm3. It’s given that the volume of the cone is nπ cm3. Therefore, the value of n is 66 .