2. 外语
  3. If a solid pyramid has 4 vertices and 4 faces, how many edges does the pyramid have?

If a solid pyramid has 4 vertices and 4 faces, how many edges does the pyramid have?

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问题 If a solid pyramid has 4 vertices and 4 faces, how many edges does the pyramid have?
选项 A、2
B、3
C、4
D、6
E、8
答案D
解析 立体几何中面和棱之间的关系为：棱数=2(面数或顶点数-1)；n=2(4-1)=6，所以D为正确答案。
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