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 ...
times~{3}~=~540^\circ\) The number of triangles in each polygon is two less than the number of sides. The formula for calculating the sum of interior angles is: \(({n}~-~{2})~\times~180^\circ ...
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