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right angle=90 degrees and a right triangle has one side of it that forms a 90 degree angle...as for the naming "right" don't know but it refers to 90 degree angle
If there are two 90 degree angles on the shape (example: squares or rectangles' corners)
A right-angle is a 90 degree angleA right triangle has one, and a 90-degree angle isone.
The degree measure of five fourths of a right angle is 112.5 degrees
A right angle