Two angles that are equal to 90 degrees are Complimentary.
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complementary angles.
They are complementary angles
Angles combining to equal 90 degrees are known as complementary angles.
A rectangle.
Total sum of angles in a triangle is equal to 180 degrees . Right triangle has a 90 deg. angle so 180-90= 90-30 = 60. The three angles are 90 60 and 30 degrees. == ==