CPM Teacher Tutorials

CC2 8.3.4: 8-94 Triangle Inequality and Triangle Creation Student eTools (Desmos)

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8-94. Imagine now that three possible measures for a triangle‚Äôs six parts (3 angles or 3 side lengths) are given.  Do you think that everyone will make the same triangle in that case?

Investigate this question for three possible side lengths given.

  1. 1.5 cm, 5 cm, and 4.5 cm.  
  2. 4.5 cm, 5 cm, and 7 cm. 
  3. 1.5 cm, 4.5 cm, and 7 cm. 

Use either one of the two technology tools below.

1. Triangle Inequality Student eTool

Move the sliders to adjust side length.

2. Triangle Creation Student eTool

Drag the vertices of the triangle to change the lengths and angles.

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