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The supplementary angle of 45 degrees is 135 degrees.
180 degrees
The angle should be of measure 180 degrees
180 degrees
144 degrees. from the triangle (180 degrees) to find the degrees of shapes with one more side, add 180 degrees. e.g. triangle (3 sides) - 180 degrees quadrilateral (4 sides) - 180 + 180 = 360 degrees