Question

a distancia entre os pontos E(8,4) e F(8,8)é?

Answer 1

$d= \sqrt{(x_e-x_f)^2+(y_e-y_f)^2}$
$d= \sqrt{(8-8)^2+(4-8)^2}$
$d= \sqrt{0^2+(-4)^2}$
$d= \sqrt{(-4)^2}$
$d= \sqrt{16}$
$d= 4$