Calculate the sum of interior angles in a pentagon. A pentagon contains 3 triangles. The sum of the interior angles is: \({180}~\times~{3}~=~540^\circ\) The number of triangles in each polygon is ...
Each triangle has 180°. The sum of the angles in a quadrilateral is 2 x 180° = 360° The sum of the angles in a pentagon is 3 x 180° = 540° The sum of the angles in a hexagon is 4 x 180 ...
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