3) Find number of diagonals of a 8 sided polygon.
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Answer:
20
Step-by-step explanation:
Number of diagonals in a polygon = n (n-3) / 2
As the polygon has 8 sides, n=8
∴ Number of diagonals = 8 (8-3) / 2
= 8 * 5 / 2
= 40 / 2
= 20
Hence, the number of diagonals is 20
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