To build a fence, Jim positioned the fence posts and then placed a 2 x 4 board at an angle between the fence posts. As he placed each picket, he measured the angle that the picket made with the 2 x 4. Why does this ensure that the picket will be parallel?

- This ensure that the picket will be parallel because it will made sure that the angle that is form with the picket and the board is congruence to the previous one. ( Could someone get the answer I just gave? Thanks)