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DISCOVERING WITH
HANDS-ON METHOD
1. On a piece of plain white paper, draw a
triangle and cut it out.
2. Label the interior of each angle and tear off
each.
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.
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.
4. What does this tell you about sum of the
angles in the triangle?

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2 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?