This activity helps students discover the angle sum property of triangles by cutting off the angles of a triangle and pasting the vertices together, which meet to form a straight line (180°).
Students paste the triangle onto a guided notes page and write about their discovery.
A 6-question worksheet is included to practice using the property.
NOTE: A protractor is needed to complete the worksheet.
Detailed directions and helpful hints in setting up the activity are included.
Answer keys are also included.