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A Locus Problem

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Phil Todd

@polymnia

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The locus of the Center of Gravity of the triangle OBA’ is shown.  (B is the intersection of the line OA with the inner circle, A’ is the image of A under reflection in the x-axis)

Looks like an ellipse.  Is it?

If so, what are the foci in terms of the circle radii.

Tags: ellipse, circle
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