The sum of the internal angles of a pentagon is 540 degrees. Here's how: **To find the sum of the internal/interior angles of a polygon there is a formula, (n  2)180 where n is the
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540. A pentagon has 5 sides with 3 triangles inside. So 3 x 180 = 540. Hope that helps.
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The angle sum of a pentagon is 540 degrees, which is the 3 triangles multiplied
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