Discussion
A frustum of a cone with end radii 20 mm and 50 mm and slant side 40 mm develops between arcs whose radii differ by
Answer: A
Correct answer: 40 mm
The two arcs bounding a frustum’s development are concentric about the apex of the complete cone, and the radial distance between them is the slant side of the frustum itself - here 40 mm. The end radii determine the two arc lengths rather than the gap between the arcs.
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