Triangle Property Theorems

kathleenh, Oct 26, 2020


  • 1. Triangle Sum Theorem
  • 2. Exterior Angles Theorem
  • 3. Isosceles Triangle Theorem
  • 4. Hinge Theorem
  • 5. Triangle Inequality Theorem
  • 6. Midsegment Theorem
  • 7. Median Theorem
  • 8. Perpendicular Bisector Theorem

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Triangle Sum Theorem

Add the measures of angle A, B and C. What is the sum of these angles?
Move points A, B and C so that the triangle has new angle measures. Find the sum of the interior angles, A, B and C. What do you notice?
What can be concluded about the interior angles of a triangle?
– kathleenh

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