Ninety degrees. The name comes (I think) from the fact that one angle of a square is ninety degrees.
Or in the case of all 4 right angles added together the sum would be 360 degrees.
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90 degrees
90 degrees
A regular trapezoid (!) is a square. And each interior angle of a square is 90 degrees.
Each interior angle of a square is 90 degrees and its 4 angles add up to 360 degrees
Each exterior angle of a square is 90 degrees and a square is a regular 4 sided quadrilateral