質問: if `z_1=8+4i`, `z_2=6+4i`and `arg((z-z_1)/(z-z_2))=pi/4`, then 'z' satisfies `1) |z-7-4i|=1 2)|z-7-5i|=sqrt(2) 3)|z-4i|=8 4) |z-7i|=sqrt(18)` if `z_1=8+4i`, `z_2=6+4i`and `arg((z-z_1)/(z-z_2))=pi/4`, then 'z' satisfies `1) |z-7-4i|=1 2)|z-7-5i|=sqrt(2) 3)|z-4i|=8 4) |z-7i|=sqrt(18)`
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