Question
The distance between the points $(7, 5)$ and $(3, 2)$ is equal to ........... $\mathrm{unit}$
=$\sqrt {{{(3 - 7)}^2} + {{(2 - 5)}^2}} = \sqrt {16 + 9} = 5$ unit.
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$\{z=a+i b: a, b \in Z, z \in C,|z-1| \leq 1,|z-5| \leq|z-5 i|\}$ is ........