## IGD: Perpendicular Lines

Grade:

9-12

Standards:

Math Content:

Geometry

Two lines are

*perpendicular*if they meet at right angles.

The two lines in the applet below are perpendicular. You can drag points

*A*,*B*, or*P*to change the lines, but notice that the angle formed by the lines will always measure 90°.*How Do You Construct Perpendicular Lines?*

- Learn how to construct a perpendicular to a line at a point on the line.
- Learn how to drop a perpendicular to a line from a point not on the line.

*What Are Some Applications of Perpendicular Lines?*

- Learn about the perpendicular bisector of a segment.