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Math·Geometry and Trigonometry·Area and volume

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For the right circular cone shown, $B$ is a point on the circumference of the base, and the length of segment $AB$ (not shown) is $84\text{ centimeters}$. If the height of the cone is $42\text{ centimeters}$ and the volume of the cone is $k\pi \text{ cubic centimeters}$, what is the value of $k$?

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