The formula for calculating the sum of interior angles is: \(({n}~-~{2})~\times~180^\circ\) (where \({n}\) is the number of sides) All the interior angles in a regular polygon are equal.
A pentagon contains 3 triangles. The sum of the interior angles is: All the interior angles in a regular polygon are equal. The formula for calculating the size of an interior angle is ...
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