alleryA pentagonal prism has pentagons at both ends. How many vertices does it have?
A5
B10
C15
D7
Answer & Solution
Correct answer: B. 10
1. Each pentagonal end has 5 corners.
2. There are two ends, so 5 + 5 = 10 vertices.
3. Check with Euler: faces 7 + vertices 10 - edges 15 = 2.
_Source: Wikipedia, Prism (geometry) (CC BY-SA 4.0), Prism (geometry)_
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