Discover the difference between parallel and perpendicular lines. Measuring angles Find out how to measure angles up to 180 degrees using a protractor. Compare and order angles Learn how to ...

However, for the lines to be parallel, the distance between the lines always stays the same. Perpendicular lines meet at a right angle. A right angle is a quarter turn, which is 90 degrees (90˚).

With both parallel lines cut, the adjacent angles and corresponding ... angle shapes with the same relative position. This angle bisector between two arms at 90 degrees (right angle) makes it ...