Question

Determine a distancia entre os pontos A (3,5) e B (-1,-2)

Answer 1

$D= \sqrt{(x_2-x_1)^2+(y_2-y_1)^2}\\ \\D= \sqrt{(-1-3)^2+(-2-5)^2}\\ \\D= \sqrt{16+49}\\ \\D= \sqrt{65}$