When it measures 90 degrees it is a right angle
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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
By using trigonometry that is applicable to a right angle triangle.
If it is 90 degrees. This means that it looks like the corner of a square or a rectangle.
Because a right angle is a right angle.