Don't have a common factor greater than 1.
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180
91, 98, 105, 112
A pair of supplementary angles add up to 180 degrees. Therefore, the supplement to a 105 degree angle is equal to 180 - 105 = 75 degrees.
35 = 5 x 7 105 = 5 x 7 x 3 175 = 5 x 7 x 5 gcf = 5 x 7 x 3 x 5 = 105 x 5 = 525
180-75=105 degrees