Education Technology

Geometry: Chords and Circles
by Texas Instruments

Published on January 24, 2012


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

Key Steps

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    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.

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

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    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.