Use their slopes to determine if two lines are parallel or perpendicular.
This video demonstrates a sample use of identifying parallel and perpendicular lines.
This video provides an explanation of the concept of identifying parallel and perpendicular lines.
Sort out a jumble of key words into categories using the Card Sort strategy. This activity may help you to develop skills for remembering key words and concepts.
Drag around a pair of perpendicular lines to see how their slopes change.