Question

j

Answer 1

distance formula
\[\sqrt{(x_0-x_1)^2+(y_0-y_1)^2}\]
notice we have the sum of two squares. this is always positive or zero because every square is positive or zero

Answer 2

and the square root of a positive/zero number is always positive or zero

Answer 3

@zzr0ck3r could've just said non-negative =P

Answer 4

lol

Answer 5

touche

Answer 6

Wait I thought this was the formula
@zzr0ck3r