Triangles properties

Terry Lee Lindenmuth, David Grimm, 2016年11月3日

Triangles: Investigations and Activities


  • 1. Sum of Angles of a Triangle
  • 2. Three Triangle Heights (altitudes)
  • 3. Area of a Triangle
  • 4. Area of Triangles with Fixed Perimeter
  • 5. Isosceles Triangle
  • 6. Isosceles Triangle Investigation
  • 7. Equilateral Triangle
  • 8. Construct an Equilateral Triangle
  • 9. Four Equilateral Triangles inside a Square
  • 10. Mid-Segments of a Triangle
  • 11. Inequalities in a Triangle - Relationship of Sides to Angles
  • 12. Triangle Inequality Investigation
  • 13. Observe location of the longest side and the largest angle.
  • 14. Triangle SSA
  • 15. SSA Testing Triangle Congruence ? Angle-Side-Side ?
  • 16. ASA - Triangle Angle-Side-Angle using Sliders
  • 17. AAA Triangle Investigation
  • 18. AAA Triangle Congruence Investigation: Angle-Angle-Angle
  • 19. Triangle AAA
  • 20. SAS - Triangle Side-Angle-Side using Sliders
  • 21. Side-Angle-Side Inequalities In Two Triangles
  • 22. SAS 6 unit, 57º, 7 units Solution
  • 23. SSS - Triangle Side-Side-Side using Sliders
  • 24. Triangle Congruence Investigation Given: Side-Side-Side
  • 25. Rolling a Circle Around the Inside of a Triangle
  • 26. Altitudes of a Triangle Investigation
  • 27. Medians of a Triangle
  • 28. Perpendicular Bisectors of a Triangle
  • 29. The Euler Line of a Triangle
  • 30. Circumcenter Google Earth
  • 31. Angle Bisectors of a Triangle
  • 32. Random Darts Hit Triangle inside Square
  • 33. Triangle's Squares Intro
  • 34. Squares of the sides of Triangles
  • 35. Shadows and Right Triangles
  • 36. Right Triangles - Pythagorean Theorem
  • 37. Right Triangle Diameter & Vertex Point On Circle
  • 38. Tessellate Equilateral Triangles
  • 39. Triangle Designs
  • 40. Triangle Designs v3
  • 41. Similar Triangles - Reflection in a Mirror
  • 42. Translate a Triangle, then Reflect it Across the x-Axis
  • 43. Translate and Reflect a Triangle : Problem N20
  • 44. Translation & Reflection of a Triangle
  • 45. Probability Dart Hits Triangle
  • 46. Net of a Triangular Prism
  • 47. Right Triangle with Ratios of a 55º Angle
  • 48. Unit Circle : Trig Functions : Special Triangles
  • 49. Volume of Cross Section - Isosceles Right Triangle
  • 50. Solid wt Circular Base & Equilateral Triangle Cross Section
  • 51. Volume of X-Section Isosceles Rt.Triangle iPad

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Sum of Angles of a Triangle

– Terry Lee Lindenmuth

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