Two intersecting lines have opening amount {angle measurement} at intersection. If lines are the same, angle between them is 0 degrees, and angle around them is 360 degrees, two times pi radians. If lines are parallel and meet at center, angle between them is 180 degrees, pi radians. If lines are perpendicular, angle between them is 90 degrees, pi/2 radians. Angle measure can use larger unit {rhumb}, which is 11.25 degrees, 1/16 of reverse turn, or one point on mariner's compass.
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Date Modified: 2022.0224