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In geometry, the incircle or inscribed circle of a triangle is the largest circle that can be contained in the triangle; it touches (is tangent to) the three sides. The center of the incircle is a triangle center called the triangle's incenter.
Related constructions, Overview & Excircles and excenters
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triangle displaystyle incircle incenter circle sides center three tangent frac area point excircle tfrac radius abc called one coordinates given
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