Triangle Theorems

William Rodgers, 22.03.2017

This book includes several theorems that are important for understanding triangles. Use each applet to discover rules about a triangles angles and sides.


  • 1. Triangle Sum Theorem
  • 2. Right Triangles
  • 3. Isosceles Triangles
  • 4. Triangle Inequality Theorem
  • 5. Exterior Angle Theorem

1.

Triangle Sum Theorem

You can move any of the vertices, A, B, and C. Change the triangle by moving one or several of the vertices. Each time you create a new triangle, add the three interior angles together. After doing this 5 times, what conclusion can you make?
Triangle
– William Rodgers

2.

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3.

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4.

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5.

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