Answer:
Step-by-step explanation:

the rectangle is but the line is not because the line has to have another side !
According to above figure, the angles (8x - 20)° and (5x + 37)° are pairs of vertical opposite angles, so
It’s the first box goes to the 3rd missing thing and the second goes to the 4th and the 3rd goes to the 1st and 4th goes to the 2nd I think if that makes sense