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Question

Sum of interior angles of a polygon of (n+1) sides =

A

(2n - 4) × 90°

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B

(n - 1) × 180°

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C

(2n - 2) × 180°

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D

(n - 2) × 180°

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Solution

The correct option is A (n1)×180

We know that
Sum of interior angles of a polygon of (n) sides =(n2)×180

Sum of interior angles of a polygon of (n+1) sides

=(n+12)×180 [Substituting n=n+1]

=(n1)×180


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