'LIN

Point 1: (x1, y1)
Point 2: (x2, y2)
General equation ax + by + c = 0
Normal equation cos(theta)x + sin(theta)y + p = 0

A: a
B: b
C: c

I: p
J: theta

M: x1
N: y1
O: x2
P: y2
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