Question

One of the rectangular components of a force 80 N is 40 N. Find the other component

Answer 1

use pythagorean theorem:
$x^2+40^2=80^2$
$x^2=80^2-40^2=40^2(2^2-1)$
$x=\pm40\sqrt{3}N$

Answer 2

using pythagoras theorm we get 40root3