The curved edge the lines touch, lying in the plane.
The straight edge the angle is measured from, lying in the plane; each line runs from its touch to where it crosses this edge's line.
A frame whose origin and normal give the plane the edges lie in; the angle turns about the normal.
OptionalangleThe angle from the reference's direction to the lines, in degrees, turning counterclockwise about the frame's normal.
OptionalangularThe tolerance of the search for touching lines, in radians; an angle this close to 0, a
right angle or a half turn is taken as exactly that.
OptionalonWhen true, keeps only the lines that touch the curve within its ends and cross the reference within its ends, which leaves out lines parallel to it.
A curve, a straight reference edge, an angle and the plane for
shapes.edge.linesTangentAtAngle, which draws every line touching the curve at that angle to the reference.