If from any point P, tangents PT, PT? are drawn to two given circles with centres A and B respectively; and if PN is the perpendicular form P on their radical axis, then \[P{{T}^{2}}-PT{{'}^{2}}=\]

If from any point P, tangents PT, PT? are drawn to two given circles w

1.	If from any point P, tangents PT, PT? are drawn to two given circles with centres A and B respectively; and if PN is the perpendicular form P on their radical axis, then \[P{{T}^{2}}-PT{{'}^{2}}=\]
A.	PN.AB
B.	\[2PN.AB\]
C.	\[4PN.AB\]
D.	None of these
Answer» C. \[4PN.AB\]

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If from any point P, tangents PT, PT? are drawn to two given circles with centres A and B respectively; and if PN is the perpendicular form P on their radical axis, then \[P{{T}^{2}}-PT{{'}^{2}}=\]

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