The inscribed circle of the triangle is tangent to all three sides.

The inscribed circles in the diagram are all congruent.

The mathematician studied the properties of circumscribed circles.

She proudly stood in the winner's circle, holding her trophy high.

The circle of Apollonius is a geometric construction that consists of all points that are equidistant from a given point (known as the focus) and a given line (known as the directrix).

The circles of Apollonius are a set of curves defined by a fixed ratio of distances from two points.

The artist created a beautiful painting with several generalized circles.

The artist created a beautiful painting with generalised circles.

A generalized circle is a geometric shape that includes both circles and other curved shapes.

A generalised circle is a geometric shape that includes both circles and other curved shapes.