Question

Which expression represents the distance between point (0, a) and point (a, 0) on a coordinate grid?

Answer 1

$\sqrt2a^{2}$ is the correct answer
Or A

Answer 2

The distance between any 2 points (x1,y1) and (x2,y2) is
$D= \sqrt{(x2-x1)^2+(y2-y1)^2}$

given
(0,a) and (a,0)
$D= \sqrt{(a-0)^2+(0-a)^2}$
$D= \sqrt{(a)^2+(-a)^2}$
$D= \sqrt{a^2+a^2}$
$D= \sqrt{2a^2}$
$D= a\sqrt{2}$

the disance is a√2