The radius of the director circle of the hyperbola $\frac{{{x^2}}}{{{a^2}}} - \frac{{{y^2}}}{{{b^2}}} = 1$, is
The radius of the director circle of the hyperbola $\frac{{{x^2}}}{{{a^2}}} - \frac{{{y^2}}}{{{b^2}}} = 1$, is
- A
$a - b$
- B
$\sqrt {a - b} $
- C
$\sqrt {{a^2} - {b^2}} $
- D
$\sqrt {{a^2} + {b^2}} $
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