Question

https://imgur.com/a/5AWCa1r

Answer 1

@Vocaloid

Answer 2

@563blackghost

Answer 3

@Ultrilliam

Answer 4

The distance d between the points
\[(x _{1},y _{1})=(1,7) and (x _{2},y _{2})=(3,1)\] is given by,
\[d=\sqrt{(x _{1}-x _{2})^{2}+(y _{1}-y _{2})^{2}},\]
\[=\sqrt{(1-3)^{2}+(7-1)^{2}},\]
\[=\sqrt{(-2)^{2}+(6)^{2}},\]
\[=\sqrt{4+36}=\sqrt{40}=2\sqrt{10}\approx6.325.\]