Question

a distancia entre os pontos p=(1,0) e Q(2,8) é ?

Answer 1

$d^2 = (x_b-x_a)^2+(y_b-y_a)^2\\\\ d^2 = (2-1)^2+(8-0)^2\\\\ d^2 = 1^2+8^2\\\\ d^2 =1+64\\\\ \boxed{d=\sqrt{65}}$