alleryA polyhedron has only flat faces. Which of these is not one?
ACone
BPrism
CCube
DCuboid
Answer & Solution
Correct answer: A. Cone
1. A polyhedron has only flat faces.
2. A cube, a cuboid and a prism have only flat faces.
3. A cone has a curved surface, so it is not a polyhedron.
_Source: Math Is Fun, Cone (mathsisfun.com/geometry/cone.html), Cone Facts_
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