I can not understand it



Why does it happen?
Is there any practical use for this?


It is just fun, i guess:

but seriously, i think you wiggle both cardinal points (top and bottom), they get bigger at the same time.


Cardinal Points have super powers, this is one of them…



It’s not only about cardinal points on an arc or circle circumference.
You can create smooth surfaces, although with not enough controle to be accurate.
Here you see a set of arc surfaces with one hidden line (marked yellow) selected and rotated about green direction:

Depending on which line is selected, and the rotation point and rotation axis, you’ll get quite different results.


I think it’s a glitch with no practical use. The scale tool is much more accurate.
If you explode the circles, then it rotates the line (instead of increasing the circle’s radiuses).


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