its called a right angle!
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An angle of 90 degrees is a right angle.
it is used as an degree. It is an unit of angle.
the most common angle used in constructing building is 90 degree.
They are two edges that make a 90 degree angle. However, the term is also loosely used for edges that make a 90 degree angle with the horizontal.
To find the degree of angle of a side of a triangle, a protractor is needed to measure the angle. Place the '0' on the protractor on the point of the angle and look at the top part to determine degree of angle. To measure the length of a triangle side, a simple ruler can be used to measure the length.