How to evaluate solid angle subtended by a finite plane bounded by straight lines

Mar 2015
11
0
Vill-Buraura, Distt-Mahoba (UP) India-210429
How to calculate solid angle (in Ste-radian) subtended by a plane bounded by the straight lines x=-8, x=12, y=-6 & y=20 in XY-plane at the point (8, -10, -6). Any help is highly appreciated. thanks ................... (Flower)(Flower)(Flower)