A frustum is the solid obtained by slicing a right-circular cone perpendicular to its axis and removing the small cone above the slice. This leaves a shape with two circular aces and a curved surface. The original cone has base radius 6 cm and height 8 cm, and the curved surface area of the frustum is equal to the area of the two circles.
What is the height of the frustum?
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3 \text{ cm}
4 \text{ cm}
5 \text{ cm}
6 \text{ cm}
7 \text{ cm}
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