Question:
Tick (✓) the correct answer:
How many diagonals are there in a pentagon?
(a) 5
(b) 7
(c) 6
(d) 10
Solution:
(a) 5
For a pentagon:
n = 5
Number of diagonals $=\frac{n(n-3)}{2}=\frac{5(5-3)}{2}=5$
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