Tick (✓) the correct answer:
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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