Students use animation to discover that the measure of an inscribed angle is half the measure of its intercepted arc, that two angles that intercept the same, or congruent, arcs are congruent, and that an angle inscribed in a semi-circle is a right angle. They then discover that the opposite angles of a quadrilateral inscribed in a circle are supplementary.

Download the attached PDF and look over the information on the first page. Download and distribute the attached student TI-Nspire document (.tns file) and student worksheet for use during the activity. A TI-Nspire solution document (.tns file) containing expected student results is also available for download.

Discuss the material from the activity pages and worksheet with students as needed.

Encourage students to summarize what they have learned from completing the activity.