For the type Line, the option Angle specifies the angle between the lead line and the tangent of the contour
at the lead position, the option Length specifies the length of the lead line.
For the type Line + Arc, the option Angle and Length mean exact the same. And a lead arc is defined with its
radius specified in the option Radius, and being tangential with both the lead line and the contour at the
same time.
On the other hand, for the type Arc, the option Angle actually specifies the angle between the chord of the
lead arc and the tangent of the contour at the lead position, the option Length specifies the length of the
chord. In addition, the lead arc is fully defined with being tangential with the contour.
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