1. Construct a circle centered at point C that goes through point A.[br][br]2. Label the intersection points of the circle and the line as A and D. Construct the midpoint of segment AD. Connect the midpoint of segment AD to point C. This new line is perpendicular to line AB.[br][br]3. After you are done, drag points A, B, and C to verify that your construction will [i]always[/i] produce a perpendicular line.[br][br]4. Use the angle measurement tool to verify that the lines are perpendicular. [br][br]5. Use the slope tool to find the slop of both lines. What observations can you make about the slopes of perpendicular lines?