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 ...

Lines of equal length are marked with dashes. In the following diagram, DE is parallel to AC, and AB = CB. a) Find the size of angle \({a}\). Give a reason for your answer. b) Find the size of ...

With both parallel lines cut, the adjacent angles and corresponding ... so you can subtract the original angle from 180 to find the missing angle measures. Draw congruent angles on a piece of ...