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There are 3 concentric circles with center $O$ and radii $3,5,7$ units.

Points $A,B,C$ are on these circles, one on each circle.

Find the minimum value of $AB^2+BC^2+CA^2$ in sq. units.

Also see

Remember the Aim in Archery?

C'mon! Archery is irrelevant here!

Only looks like Archery Aim -_-

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