Question

The distance AB rounded to the

Answer 1

Answer:

first of all, the formula given is wrong

it is,

$\sqrt{(x_2-x_1)^2+(y_2-y_1)^2)}$

so,

let's say

$(x_2,y_2)=(-1,1) \\(x_1,y_1)=(3,1)$

you can choose arbitrarily, answer will be the same

$= \sqrt{(-1-3)^2+(1-1)^2)}\\=\sqrt{4^2+0}\\=4$