Tracks
Train tracks run parallel to each other. When we measure the angle between the tracks in an image, are they parallel? Use the red line segments to determine the angle the train tracks appear relative to each other in each image (the Forward image, the Angle image, and the Side image). Place one red line segment along a track, then place the other red line segment along the supposedly parallel track. If two segments are parallel in these images, the angle given should be 0°.