Discussion
Which one of the following 3D shapes does not have a vertex?
Answer: D
The shape without a vertex is the sphere.
A vertex is a corner point where edges meet. A sphere has one continuous curved surface, with no edges and no corners at all.
A pyramid has an apex and the corners of its base, a prism has the corners of its two bases (a triangular prism has 6), and a cone has one vertex at its tip, even though its base is a curved edge.
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