Definition:Circumradius/Polygon
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Definition
The circumradius of a polygon is the radius of the circle inside which the polygon can be inscribed, if such a circle exists.
Circumradius of Triangle
A radius of a circumcircle of a triangle is called a circumradius of a triangle.
In the above diagram, $R$ is a circumradius.
Also known as
Some sources hyphenate: circum-radius.