The sum of the measures of the n interior angles of an n-gon is 180(n-2)
180 (45-2) = 180 * 43 = 7740 degrees
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Sum of exterior angles: 360 degrees Sum of interior angles: 2160
The sum of two complementary angles is 90 degrees. The sum of two supplementary angles is 180 degrees.
The sum of the exterior angles of a polygon is 360o.
Two angles with a sum of 90 are called complimentary angles.
The sum of the four interior angles is 360 degrees.