Задача 53799 хелп...

5f6c65a2019fbf2dafd19b19

01.10.2020 18:44:02

хелп

5f3ea7e3faf909182968ddd9

01.10.2020 18:49:11

★

[m]O(\frac{1}{3}(x_{A}+x_{B}+x_{C}); \frac{1}{3}(y_{A}+y_{B}+y_{C})=(0;0)[/m]

[m]OA=\sqrt{(7-0)^2+(2-0)^2}=\sqrt{49+4}=\sqrt{53}[/m]

[m]OB=\sqrt{(1-0)^2+(9-0)^2}=\sqrt{1+81}=\sqrt{82}[/m]

[m]OC=\sqrt{(-8-0)^2+(-1-0)^2}=\sqrt{64+1}=\sqrt{65}[/m]