Discussion
Match the solid with the shape of its lateral development.
1. Right cylinder 2. Right cone 3. Frustum of a cone
P. A sector of a circle Q. A rectangle R. The region between two concentric arcs
Answer: D
Cutting the apex from a cone's sector leaves the band between two arcs, which is why the apex must be located even when it has been removed. The cylinder's parallel generators give a rectangle rather than any curved pattern.
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