Perpendicular Lines Definition (& Consequence)
- Tim Brzezinski
In the applet below, the line that passes through points A & B and the line that passes through points A & C are said to be PERPENDICULAR LINES. Click the red checkbox to show/illustrate what it means for lines to be perpendicular. Then, move/drag points A & B around. 1) Complete the following sentence definition: Two lines are said to be PERPENDICULAR LINES if and only if _______________________________________________________. Now, click on the other green checkbox that appeared as well. Move points A & B around again. What do you notice? 2) Complete the following: If two lines graphed in the coordinate plane are PERPENDICULAR, then their slopes _________________________________________________.