# Parallels & Perpendiculars: Ex. 7

- Author:
- Tim Brzezinski

## DIRECTIONS:

In the applet below, please do the following:
1) Use the PARALLEL LINE tool to construct a line through .
When you're done (or if you're unsure of something) feel free to check by watching the brief silent screencast below the applet.

*C*parallel to line*f*. 2) Use the SLOPE tool to measure and display the slopes of both lines. (They should be equal.) 3) If you want to see a grid, right-click and select "Show Grid" (or select the Grid option in upper right). 4) Use the PERPENDICULAR LINE tool to construct a line through*D*that's perpendicular to*f*. 5) Plot the point of intersection of line*f*and the line you just constructed in (4). 6) Verify the measure of the angle at which line*f*and the line you constructed in (4) =