Invariant Area of Ring

Author:
Esther Gruenhut

Use the scroll bar to unfold the problem.

Use the scroll bar to unfold the problem.

use the slider to change the length of segment AB (and of course, for full effect move point O)

use the slider to change the length of segment AB (and of course, for full effect move point O)

Why does this happen?

Why does this happen?

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