Question

find the sum of all angles of an pentagon​

Answer 1

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Since there are 5 sides in a pentagon, substitute the side length . Divide this by 5 to determine the value of each angle, and then multiply by 2 to determine the sum of 2 interior angles.

Answer 2

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From vertex A we can draw two diagonals which separates the pentagon into three triangles. We multiply 3 times 180 degrees to find the sum of all the interior angles of a pentagon, which is 540 degrees.