Education Technology

Cabri Jr. Inscribed Angles

Published on 04/10/2006

Activity Overview

This activity uses Cabri™ Jr to discover that inscribed angles subtended by the same arc in a circle are congruent.

Before the Activity

1. Draw a circle in the center of the screen. Label the center O.

  • Use the point tool to make four points on the circle. Do not use the radius point of the circle as one of the points. Label the points A, B, C and D as in Figure 1a.
  • Construct an angle BAC using the Segment tool.
  • Construct an angle BDC using the Segment tool. See Figure 1b.
  • During the Activity

    Students will use Cabri™ Jr to discover that inscribed angles subtended by the same arc in a circle are congruent

    After the Activity

    Review student answers:

  • As a class, discuss questions that appeared to be more challenging
  • Re-teach concepts as necessary