Question

E2.
Помогите пожалуйста!!!!!!​

Answer 1

$AB=\sqrt{(-5-2)^2+(7-3)^2+(2-1)^2}= \sqrt{49+16+1}=\sqrt{66}\\BC=\sqrt{(1-(-5))^2+(5-7)^2+(3-2)^2}= \sqrt{36+4+1}=\sqrt{41}\\CA=\sqrt{(2-1)^2+(3-5)^2+(1-3)^2}= \sqrt{1+4+4}=3$

$AB+BC+CA=\boxed{\sqrt{66} +\sqrt{41} +3}$