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.
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Formula for calculating center to end distance of such elbows is as follows: For 90° Long Radius elbows, center to end dimension given in dimension tables of ASME B16.9 is same as radius of elbow. This is because Tan (90/2) i.e. Tan 45 is 1. Normally custom elbow angles from 45 degree to 90 are cut from 90 degree standard elbow. If that's what you were asking about...
Measure 45o
39in.
A 90 degree rotation is a quarter of a turn.
9in