Method 2

1. DISCOVERING WITH
HANDS-ON METHOD

2. 1. On a piece of plain white paper, draw a
triangle and cut it out.

3. 2. Label the interior of each angle and tear off
each.

4. 3. Now tear off each corner of the triangle and
rearrange the 3 “angles” so that their vertices
meet at one point with no overlap.

5. 3. Now tear off each corner of the triangle and
rearrange the 3 “angles” so that their vertices
meet at one point with no overlap.

6. 4. What does this tell you about sum of the
angles in the triangle?