alleryPentagonal pyramid: base edges plus slanting edges. Total edges?
A10
B15
C6
D5
Answer & Solution
Correct answer: A. 10
1. The pentagonal base has 5 edges.
2. The apex is joined to the 5 base corners by 5 more edges.
3. So 5 + 5 = 10 edges.
4. Check with Euler: faces 6 + vertices 6 - edges 10 = 2.
_Source: Wikipedia, Pyramid (geometry) (CC BY-SA 4.0), Pyramid (geometry)_
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