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One Interior Angle
Make sure each triangle here adds up to 180 and check that the pentagon s interior angles add up to 540 the interior angles of a pentagon add up to 540.
One interior angle. Its interior angles add up to 3 180 540 and when it is regular all angles the same then each angle is 540 5 108 exercise. To find the measure of an interior angle of a regular octagon which has 8 sides apply the formula above as follows. All the angles in a square are equal to 90.
So 360 4 90. The sum of the measures of the interior angles of a polygon with n sides is n 2 180. The measure of each interior angle of an equiangular n gon is if you count one exterior angle at each vertex the sum of the measures of the exterior angles of a polygon is always 360.
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