Quote:
Originally Posted by Laurence Finston
Then, the perpendicular to the line R3R1 passing through R4 is found, followed by the point R5, lying on the perpendicular on the opposite side of R3R1 to R4.
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This is wrong. R5 can't lie on the "opposite side" of R3R1, because R4 lies on the line. R5 lies on the perpendicular of R3R1 in the direction toward the center of the circle.