The radius of the director circle of the hyperbola \[\frac{{{x}^{2}}}{{{a}^{2}}}-\frac{{{y}^{2}}}{{{b}^{2}}}=1\], is [MP PET 1999]

The radius of the director circle of the hyperbola \[\frac{{{x}^{2}}}{

1.	The radius of the director circle of the hyperbola \[\frac{{{x}^{2}}}{{{a}^{2}}}-\frac{{{y}^{2}}}{{{b}^{2}}}=1\], is [MP PET 1999]
A.	\[a-b\]
B.	\[\sqrt{a-b}\]
C.	\[\sqrt{{{a}^{2}}-{{b}^{2}}}\]
D.	\[\sqrt{{{a}^{2}}+{{b}^{2}}}\]
Answer» D. \[\sqrt{{{a}^{2}}+{{b}^{2}}}\]

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The radius of the director circle of the hyperbola \[\frac{{{x}^{2}}}{{{a}^{2}}}-\frac{{{y}^{2}}}{{{b}^{2}}}=1\], is [MP PET 1999]

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