Tangents drawn from origin to the circle \[{{x}^{2}}+{{y}^{2}}-2ax-2by+{{b}^{2}}=0\]are perpendicular to each other, if [MP PET 1995]

Tangents drawn from origin to the circle \[{{x}^{2}}+{{y}^{2}}-2ax-2by

1.	Tangents drawn from origin to the circle \[{{x}^{2}}+{{y}^{2}}-2ax-2by+{{b}^{2}}=0\]are perpendicular to each other, if [MP PET 1995]
A.	\[a-b=1\]
B.	\[a+b=1\]
C.	\[{{a}^{2}}={{b}^{2}}\]
D.	\[{{a}^{2}}+{{b}^{2}}=1\]
Answer» D. \[{{a}^{2}}+{{b}^{2}}=1\]

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Tangents drawn from origin to the circle \[{{x}^{2}}+{{y}^{2}}-2ax-2by+{{b}^{2}}=0\]are perpendicular to each other, if [MP PET 1995]

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