90
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One right angle is 90 degrees. If it's anything else, it's not a "right" angle.
The complement is (90 - the angle) or: how much you have to add to the angle to make 90 degrees.(90 - 72.354) = 17.646 degrees.
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.
90 degrees
It is 90 degrees