Resposta :

MATHSPHIS
[tex]a)d_{AC}=\sqrt{(3-(-7))^2+(9-0)^2}=\sqrt{(3+7)^2+9^2}= \\ \sqrt{10^2+9^2}=\sqrt{100+81}=\sqrt{181}[/tex]

[tex]b)d_{DM}=\sqrt{(4-\frac{1}{2})^2+(-6-(-1)^2}=\sqrt{(\frac{7}{2})^2+(-6+1)^2}= \\ \sqrt{\frac{49}{4}+25}=\frac{\sqrt{149}}{4} [/tex]

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