Education Technology

Geometry: Angles and Arcs
by Texas Instruments

Updated on February 12, 2015


Students explore angles constructed in a circle and how their measures are related to the measures of the intercepted arcs.

Key Steps

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    In Problem 1, students explore inscribed and central angles using Cabri™ Jr. They will see a central angle AOB has been constructed and measured. The central angle measure is used as the arc measure.

    Students construct a point labeled C and construct two segments AC and BC.

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    They will realize that the measure of the arc is twice that of the measure of angle ACB.