Incircle

Definitions

A circle within a polygon, especially a triangle, that is tangent to each side.

Equivalents

Examples

“To construct the incircle of ΔABC, we need⟳ the center of the circle and a pass-through point⟳.”

“Having constructed K, the incircle of the quadrilateral can be easily constructed since it is tangent to BA and BC.”

“For example, in Figure⟳ 4.2a only two edges of the polygon are tangent to the incircle. The other four edges do not even touch⟳ the incircle, but their extensions, shown by dotted lines, are tangent to the incircle.”

CEFR level