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Supplementary means the sum of two angles equal to 180 degrees. The Sum of 90 degrees would be complimentary, where the sum of two angles equal to 90 degrees.
The sum of two complementary angles is 90 degrees. The sum of two supplementary angles is 180 degrees.
Complementary angles add up to 90 degrees
complementary
Two 90 DEG angles make 180 DEG Plane? 90+90=180