Nope. It is complementary angles that add to 90 degrees.
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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.
They can be but not always because supplementary angles add up to 180 degrees.
An equilateral triangle has 3 congruent angles that add up to 180 degrees.
No, supplementary angles just add up to 180 degrees. It does not matter how these 180 degrees are distributed.
A.A 10° angle is congruent to a 10° angle.B.Congruent angles always add up to 90°.C.A congruent angle is always 90°.