If a polygon has n sides, which formula can be used to find the sum of its interior angles?

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A (n-1)x180
B (n-2)x180
C (n+2)x180
D n x 180

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Answer: B. (n-2)x180

A polygon with n sides can be divided into n-2 triangles. Since each triangle has angles adding up to 180degree sums of angles =(n-2)x180 For a 5-sided polygon : (5-2) x 180=540

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If a polygon has n sides, which formula can be used to find the sum of its interior angles?

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