This math skill teaches how to calculate the sum of the inside angles of polygons. It explains that triangles have a total of 180 degrees, quadrilaterals have 360 degrees, and pentagons have 540 degrees. This rule applies regardless of the shape's regularity.
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Sum of the inside angles of a shape
Test your understanding of sum of the inside angles of a shape by practicing it! Work through the below exercises to use it in practice.
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What are the sums of the inside angles of these shapes?
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Triangles always add up to 180 degrees, four sided shapes always add up to 360 degrees, and five sided shapes always add up to 540 degrees
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This rule works even for irregular shapes. This is a triangle, for example, so the inside angles will always add up to 180 degrees