Geometry

Question Analysis:
This question asks students to identify valid pyramids based on shape structure.
The main focus is: base shape, face type, and apex convergence.

Key Concept Explanation:
To be classified as a pyramid, a shape must have:
One polygon base
Triangular lateral faces
All lateral faces meeting at one apex

Step-by-Step Solution:
A: Square base + triangle sides + apex → ✅
B: Circular base + curved surface → cone ❌
C: Hexagon base + 6 triangles + apex → ✅
D: Two bases = prism ❌
E: T...