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hi
as you know the 45 deg. elbow looks like one quarter of a circle and you have two major radii ( Heel & Throat) ; so :
1st two surfaces( top&bottom) are equals to 0.25*(A1 - A2) where:
A1 = pi*Rh^2 ---- Rh : Heel Radius
A2 = pi * Rt^2 ----- Rt: Throat Radius
2nd Areas ( sides) are equals to rectangular areas ; so it's:
A3 = A4 = W*H ,, Now you have 4 surfaces ,,
Good Luck,,
Moath
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