# Slopes and Angles (2)

- Author:
- Tim Brzezinski

- Topic:
- Algebra, Angles, Difference and Slope, Geometry

## Use the sliders (or input boxes) to change the slopes of lines j and k so they become perpendicular.

## Same directions as above, yet this time create a pair of slopes that's different from the pair you discovered above.

## Same directions as above, yet this time create a pair of slopes that's different from the pair you discovered above.

Check out the pairs of slopes you have in the apps above. List them below:

Notice anything interesting? If so, describe. What exactly causes the lines to be perpendicular?