Definition:Incircle
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Incircle
The incircle of a triangle is the circle tangent to each side of the triangle. This circle is said to be inscribed in the triangle.
In the above, $r$ is the inradius.
Incenter
The center of an incircle is called an incenter.
Inradius
The radius of an incircle is called an inradius.
Compare To
Compare incircles to circumcircles and excircles.