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A 90 degree rotation is a quarter of a turn.
90 degree
The formula for calculating the 90 degree elbow is W+R*2*3.14/4*P=Meter Square . The area is computed by using the formula (W+R)_π/4_P.
Measure 45o
A right triangle has a 90 degree angle in it. This is not to be confused with a wrong triangle, which has two 90 degree angles.