CPM Student GuidebookCC Integrated 2 eTools Chapter 1INT2 1.3.3: Triangle Sum Theorem (Desmos)

INT2 1.3.3: Triangle Sum Theorem (Desmos)

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1. Triangle Sum Theorem:

Triangle Sum Theorem:

2. How does "Show Parallel Lines" help when determining the sum of the interior angles of a triangle?

How does "Show Parallel Lines" help when determining the sum of the interior angles of a triangle?