Exploring Perpendicular Lines This activity will help you meet this educational goal: You will explore the relationship of the slopes of perpendicular lines on a coordinate plane. Directions Read the instructions for this self-checked activity. Type in your response to each question and check your answers. At the end of the activity, write a brief evaluation of your work. Activity Use GeoGebra to explore the relationship between the slopes of perpendicular lines. For help, watch these short GeoGebra videos about creating lines and using measurement tools. Part A Create a line that is perpendicular to and passes through point C. Use the tools available in GeoGebra to create perpendicular lines for this construction. Take a screenshot of your results, and paste it below.