Two circle are externally tangent. Lines $P A B$ and $P A^{'} B^{'}$ are common tangents with $A a n d A^{'}$ on the smaller circle and $B^{p r i m e} a n d B^{'}$ the on the larger circle. If $P A = A B = 4,$ then the square of the radius of the circle is___________

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Two circle are externally tangent. Lines

P A B

and

P A^{'} B^{'}

are common tangents with

A a n d A^{'}

on the smaller circle and

B^{p r i m e} a n d B^{'}

the on the larger circle. If

P A = A B = 4,

then the square of the radius of the circle is___________

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