A right angle.
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2 90 degree (right) angles
A square has four 90 degree angles at each corner
4 right angles. A right angle is a 90 Degree measure like for example: L <---- 90 degree measure. And the rectangle has 4 angles like that so it means it has 4 right angles.
If it has four 90 degree angles, than it's a square, and therfore only has four angles.
ans: 50 degree. its complement is 90-50=40 degree