What can you say about the sum of the measures of two angles whose sum is 90°? 180°?
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the sum of the measures of two angles whose sum is 90° are known as complementary angles
eg 60° and 30°, 45° and 45°
forms a right angle, perpendicular to a line
the sum of the measures of two angles whose sum is 180° are known as supplementary angles
eg 130° and 50°, 90° and 90°
forms a line
hope this helps
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