Education Technology

# Activities

• ##### Subject Area

• Math: Geometry: Circles

9-12

30 Minutes

• ##### Device
• TI-83 Plus Family
• TI-84 Plus
• TI-84 Plus Silver Edition
• TI-84 Plus C Silver Edition
• TI-84 Plus CE
• ##### Software

TI Connect™
TI Connect™ CE

• ##### Accessories

TI Connectivity Cable

## Chords and Circles

#### Activity Overview

Students explore how the chord in a circle is related to its perpendicular bisector.

#### Key Steps

• This activity has a brief introduction that gives students a real life application using the idea of circles and chords.

It tells students the method by which a rescuer uses the electromagnetic field produced by a rescue beacon to find survivors of an avalanche.

• In problem 1, Students construct a chord to represent the path of a rescuer as he follows the signal of the rescue beacon.

• They construct a perpendicular line to AB through a midpoint M. The rescuer walks away until the signal disappears. The rescuer does this until he narrows the area down to which the signal is coming from.