Tick (✓) the correct answer:


Tick (✓) the correct answer:

How many diagonals are there in an octagon?

(a) 8

(b) 16

(c) 18

(d) 20


(d) 20

For a regular $\mathrm{n}$-sided polygon:

Number of diagonals $=: \frac{n(n-3)}{2}$


For an octagon:




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