The radius of the circle $\left|\frac{z-i}{z+i}\right|=5$ is

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Professor PC Thomas Classes · Answer

$\left|\frac{z-i}{z+i}ight| = k 
eq 1$ represents a circle. Rearranging gives radius $\frac{2|k|}{k^2-1} = \frac{10}{24} = \frac{5}{12}$. [FLAG: Options don't match, verify radius formula]