1.

Two concentric circles of radii a and b, where \[a>b,\]are given. The length of a chord of the larger circle which touches the other circle is   

A. \[\sqrt{{{a}^{2}}-{{b}^{2}}}\]
B. \[2\sqrt{{{a}^{2}}-{{b}^{2}}}\]
C. \[\sqrt{{{a}^{2}}+{{b}^{2}}}\]
D. \[2\sqrt{{{a}^{2}}+{{b}^{2}}}\]
Answer» C. \[\sqrt{{{a}^{2}}+{{b}^{2}}}\]


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