## 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.

### IGD: Constructing a Perpendicular Line

9-12

Use this tool to show how to construct a perpendicular line from a point on a line.### IGD: Dropping a Perpendicular Line

9-12

Use this applet to show how to drop a perpendicular from a point onto a line.### IGD: Perpendicular Bisector

9-12

Use this tool to demonstrate how to draw a perpendicular bisector.