Aterm for a geometric figure that is enclosed by a circle.

we know that

Circumcircle:

In geometry, the circumscribed circle or circumcircle of a polygon is a circle which passes through all the vertices of the polygon

so, any figure enclosed by circle is called as circumcircle

For exp:

The figure attached

we can see that triangle is inside circle

so,

a geometric figure that is enclosed by a circle is circumcircle

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