They are complementary
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NO because a parrallelogram always has to add up to 360
No, the interior must add up to 180 degrees, which is two 90 degree angles. A triangle must have three angles, which means it may only have one 90 degree angle. The other two must each be less than 90 degrees.
A right angle triangle has a 90 degree angle with two acute angles and the 3 interior angles add up to 180 degrees
Two angles that add up to 90 degrees are called complementary angles.
If they share a ray, then they are basically combined together and since complementary angles add up to 90 degree angles a right angle is formed.