Discussion
A solid with a vertex and a base that is formed by a simple closed curve is a
Answer: B
A cone has a single apex and a base bounded by a simple closed curve - in the familiar right circular cone, that curve is a circle.
The distinction from a pyramid is exactly the base: a pyramid's base is a polygon, made of straight edges, while a cone's is a smooth closed curve.
A triangle is a plane figure, not a solid, and a dice is a cube with no apex at all.
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