Definition:Circumcircle
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Circumcircle
The circumcircle of a triangle is the circle that passes through all three of the triangle's vertices. This circle is said to circumscribe the triangle.
In the above diagram, $R$ is the circumradius.
Circumcenter
The center of an circumcircle is called a circumcenter.
Circumradius
The radius of an circumcircle is called a circumradius.
