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Copy of Excircles of a Triangle

Excircles of a Triangle: Using the Incenter of a Triangle, how could you create the three Excircles of the triangle? Use the check boxes to explore the features of this sketch and try to create this sketch for yourself.
What are excircles? What is their relationship to the triangle? What is their relationship to the lines that extend the triangle? Where are the centers of the excircles located? Explain how to find these centers. Be specific.