Circle properties
Circle
Center
Radius
Chord
Diameter
Secant
Tangent
Point of tangency/point of contact
Concentric circles
Central angle
Minor arc
Major arc
Semicircle
The measure of a minor arc
The measure of a major arc
The measure of a semicircle
A line in a plane of a circle and containing an interior point of the circle intersects the
circle in two points.
A tangent to a circle is perpendicular to the radius drawn to the point of tangency.
A line in the plane of a circle and perpendicular to a radius at its outer endpoint is tangent
to the circle.
If in a circle or congruent circles two central angles are congruent, their arcs are
congruent.
If in the same circle of congruent circles two minor arcs are congruent, their central
angles are congruent
In the same circle or in congruent circles, congruent chords have congruent arcs.
I the same circle or in congruent circles, congruent arcs have congruent chords.
A diameter that is perpendicular to a chord bisects the chord and its two arcs.
In the same circle or in congruent circles, chords that are equally distant from the center
are congruent.
In the same circle or in congruent circles, congruent chords are equally distant from the
center.
