Definition:Circumcircle of Triangle

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.


 * Circumcircle.png

In the above diagram, $R$ is the circumradius.

Circumcenter
The center of a circumcircle is called a circumcenter.

Circumradius
The radius of a circumcircle is called a circumradius.

Also see

 * Definition:Incircle of Triangle
 * Definition:Excircle of Triangle.