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An equilateral triangle of side 14 centimeters is revolved about an altitude to form a cone. What is the number of cubic centimeters in the volume of the cone? Express your answer to the nearest whole number, without units.

how do we do this?!

What is the formula for area of cone?

or, more to the point, the volume of the cone is

1/3 pi r^2 h

you can figure r and h easily enough.

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