Two circles are externally tangent. Lines \( P A B \) and \( P A^{\...

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Two circles are externally tangent. Lines \( P A B \) and \( P A^{\prime} B^{\prime} \) are
P common tangents with \( A \) and \( A^{\prime} \) on the smaller circle and
W. \( B \) and \( B^{\prime} \) the on the larger circle. If \( P A=A B=4 \), then the square of the radius of the smaller circle is
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