Question

a distancia entre os pontos P(√20,0) e Q(0,√16)e

Answer 1

$d_{PQ}=\sqrt{(x_Q-x_P)^2+(y_Q-y_P)^2}\\\\d_{PQ}=\sqrt{(0-\sqrt{20})^2+(\sqrt{16}-0)^2}\\\\d_{PQ}=\sqrt{(\sqrt{20})^2+(\sqrt{16})^2}\\\\d_{PQ}=\sqrt{20+16}\\\\d_{PQ}=\sqrt{36}\\\\\boxed{d_{PQ}=6}$