Factors From Differential Elements to Finite Areas
B-8: Differential planar element to plane rectangle. Planes containing dA1 and A2 intersect at angle 0 < Φ < π. Element dA1 lies on normal to line of intersection between planes with origin at one corner of rectangle.
Definitions: A=a/b; C=c/b; X=1/[A2+C2-2ACcosΦ]1/2; Y=(1+C2sin2 Φ)1/2
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