There's no Archery without Aim!

Geometry Level 3

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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