A right angle
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A 90 degree angle is a right angle.
A 90 degree angle is also known as right angle. A right angle (or 90 degrees) looks like an L shape. A square or rectangle's four corners are all 90 degrees.
the complement of an acute angle (less than 90 degrees) is 90 minus the angle which is 71 degrees in this case.
A right angle is a 90 degree angle.
A 90o angle is a right angle, and a triangle with a right angle is called a right triangle.