Factors From Differential Elements to Finite Areas
B-6: Planar element to rectangle with right triangle added. Vertex of added triangle at end of rectangle nearest element.
Reference: Hamilton and Morgan, 1952.
Definitions: Z=A-C cosΦ; A=a/b; C=c/b; k=tanΘ; X=[(k2+1)C2sin2Φ+Z2]1/2; Y=(1+C2sin2Φ)1/2
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