Rules of Circles

A circle is the set of all points in a plane that are at a given distance from a given point. The given point P is called the center of the circle and the given distance is called the radius of the circle.

Rules of Circles

A diameter is a line segment that connects two points on the circle and goes through the centre of the circle.

Rules of Circles

A central angle is an angle whose vertex is the center of the circle..

Rules of Circles

An arc is part of a circle connecting two points of the circle.

Rules of Circles

A chord of a circle is a segment whose end points lie on the circle.

Rules of Circles

Rules of Chords

Rules of Chords

The radius is the same length no matter what point of the circle it is touching

Rules of Chords

If the radius intersects a chord at a 90° angle then the chord is bisected or cut into two congruent parts.

Practice

Using Pythagorean Theorem