# Surf for More Math

## CHAPTER 7: 2-D GEOMETRY

**Lesson 6: Perpendicular Bisectors **

Use these interactive activities to encourage students to have fun on the Web while learning about 2-D geometry. Students can try these activities on their own or in pairs.

**Goal**

Construct perpendicular bisectors.

**Builds Upon**

Student Book pages 307–314

**Instructions for Use**

**Perpendicular Bisector: Interactive Tutorial** allows students to explore the properties of the perpendicular bisector.

Review the properties of a perpendicular bisector and how to create one.

Complete the Interactive Tutorial. Make sure you know why the perpendicular bisector you create satisfies the definition of a perpendicular bisector.

**IGD: Perpendicular Bisector** allows students to use this online tool to create a perpendicular bisector.

To use this online tool, read the Instructions and click on the “Draw Congruent Circles” button. This will create circles around points A and B. Now use your mouse to drag point A or point B so that the circles intersect and a perpendicular bisector is created, using points P and Q. Make sure you know why certain line segments and triangles are congruent and what that tells you about the measurement of the angle between the original line segment and your perpendicular bisector.