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Angles aren't congruent. Equal angles do not add up to 90 degrees unless they are 45 degrees. Complementary angles, by definition, add up to 90 degrees.
It is: 90 degrees because supplementary angles add up to 180 degrees.
Nope. It is complementary angles that add to 90 degrees.
-- one of them is 90 degrees -- the other two add up to 90 degrees
A Right Isosceles Triangle is a shape that has one 90° angle. 90 degrees + the other two angles add up to 180 degrees.