Find the angle which is the result of the subtraction b2 - b1, where b1 and b2 are the bearings.. Measuring distance between objects in an image with OpenCV. r = math.sqrt (math.pow (!dx!, 2) + math.pow (!dy!, 2)) ra = math.sqrt (math.pow (!dxa!, 2) + math.pow (!dya!, 2)) c = math.asin (abs ( (dx dya - dy dxa))/ (r*ra)) / math.pi * 180. I think an image describes best what I want: Given (P1x,P1y) and (P2x,P2y) what is the best way to calculate this angle? Angle Between Two Lines Let y = m1x + c1 and y = m2x + c2 be the equations of two lines in a plane where, m 1 = slope of line 1 c 1 = y-intercept made by line 1 m2 = slope of line 2 c2 = y-intercept made by line 2 Florida Road, Durban,
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