Answer :

Given: Number of sides of polygon = 20

Sum of the angles of n-sided polygon = (n – 2) × 180°

⇒ S = (20 – 2) × 180°

⇒ S = 18 × 180°

⇒ S = 3240

∴ The sum of the angles of 20-sided polygon is 3240°.

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