If a polygon has 8 sides (octagon), how many diagonals does it have?

Topic: Geometry &amp; Mensuration
Subtopic: Diagonals

A14

B20

C24

D28

Explanation

Number of diagonals in an n-sided polygon = n(n – 3) / 2 = 8(8 – 3) / 2 = 8 * 5 / 2 = 20.

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