Move points

*A*,*B*, and*C*to choose the triangle size and shape you want. Move sliders and to the extremer right.- What do you observe about angles
*t*,*u*and*v*? - What is the sum of
*v*,*u*, and*t*? Justify your answer. - Based on your observations above, what can you say about the sum of the interior angles of a triangle? Explain your answer.

**Snapshot**

I will learn more about this theorem. I try to keep my brain busy. Thanks!

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