Investigate the special relationship of the angles of a triangle.

Make a conjecture about the sum of the measures of the interior angles of a triangle and prove the Triangle Sum Theorem

• adjacent angles
• interior angles

This “create your own” activity is designed to be student-centered, with the teacher acting as a facilitator while students work cooperatively. The time varies for this activity depending on whether the TI-Nspire document (.tns file) is provided or created by the students.