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Incenter & Incircle (A)

Interact with the applet below for a few minutes. Be sure to change the locations of the triangle's BIG WHITE VERTICES each time before you re-slide the slider!

1) What are the first constructions being made? i.e. what do the green, pink, and blue sectors showing you?

The Purple circle is called an INCENTER. Why do you thing this is the case?