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Daffy · Answer 1 · 2019-02-08T13:08:01+0000

The sum of supplementary angles is 180°. To find the measure of the supplementary angle of 88.9°, make an equation.
a + 88.9 = 180

Solve for a
a + 88.9 = 180
a = 180 - 88.9
a = 91.1

The measure of the supplementary angle is 91.1°

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