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