Two concentric circles are given having radii \( \mathrm{a} \) and \( \mathrm{b} \) where \( a \...

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Two concentric circles are given having radii \( \mathrm{a} \) and \( \mathrm{b} \) where \( a \) is greater than b, then the length of a chord of larger circle which touches the other is
a. \( 2 \sqrt{a^{2}-b^{2}} \)
b. \( 2 \sqrt{\mathrm{a}^{2}+\mathrm{b}^{2}} \)
-c. \( a^{2}-b^{2} \)
d. \( \sqrt{a^{2}-b^{2}} \)
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