In order to determine if the lines are parallel, we want to show that a pair of corresponding angles are congruent.[br][b]Step 1: [/b]Identify a pair of corresponding angles to measure[br][b]Step 2:[/b] Find the measurement of the angles using the angle measure tool in the tool bar. It is located next to the arrow.[br] *Click on the angle measure in the toolbar (the angle measure tool will show up again so click on it)[br] *Then, click on the three letters in the same order you would name the angle. [br] *If the angle measure is not the interior angle, undo and change the order in which you are selecting points)[br][b]Step 3:[/b] Click on the arrow in the toolbar, then select A to move the transversal and analyze what happens to the corresponding angles.