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Slide 2:
Switch to “Edit Points” mode and select either of the two largest arcs.
Notice that the end handle does not correspond to the end of the rendered arc. The difference is smaller for the other, smaller arcs, but can be seen by zooming in.
Slide 3:
Switch to “Edit Points” mode and select the arc.
Notice again that the end handle does not correspond to the end of the rendered arc.
The blue line shows the correct length for the chord. So the arc handle seems to be drawn at the correct position, but the rendered arc is too long.