# Table of Contents

A circle circumscribed around a triangle. An inscribed triangle. Definitions

The theorem of the circumscribed circle

The circumscribed circle’s center of the triangle

The circumscribed circle’s center, the orthocenter and the middle of the side of a triangle

The circumscribed circle of a triangle and the tangents to this circle

The circumscribed circle’s radius. Formulas

The circumscribed circle’s radius and the area of a triangle

The distance from the vertex of a triangle to the orthocenter