Perpendicular Lines

1. Write down the rise and run of the line a.
2. Write down the slope of the line a.
3. Make the line b perpendicular to a by moving the blue dot. The screen will tell you if you've done it correctly.
4. Write down the rise and run of the line b. (Note if isn't a rise, and is actually a fall or is going downwards then you should use a negative number for the fall)
5. Write down the slope of the line b.
6. Compare the answers to questions 2 and 5

(c) Project Maths Development Team 2011, Created with GeoGebra