Chapter 9

the set of points in a plane equidistant from a given point (notation: ⊙A, with A being the center)

The fixed point in the center of a ⊙ (notation: A)

dist from center to a pt. on a circle (segment notation)

a segment that joins 2 points on the ⊙

A line that contains a chord

A chord that contains the center

A line that intersects a circle in exactly one point

The intersection point of a tangent to a ⊙

A set of points in space equidistant from a fixed point

Have ≅ radii

have the same center

All vertices are on the ⊙

⊙ is around the polygon

If a line is tangent to a circle, then it is ⊥ to the radius

Tangents to a circle from a point are ≅

If a line in the plane of a circle is perpendicular to the radius at its outer endpoint, then the line is tangent

an angle whose vertex is on the center of a circle

an unbroken piece of a circle (minor, major, and semi)

Arcs that have exactly one point in common

arcs in the same circle or congruent circles that have equal measure

basically SAP but with arcs

in the same circle or congruent circles, two minor arcs are congruent if and only if their central angles are congruent.

in the same circle or congruent circles, congruent arcs have congruent chords, and congruent chords have congruent arcs

A diameter that is perpendicular to a chord bisects the chord and its arc

in the same circle or congruent circles, chords equally distant from the center(s) are congruent, and congruent chords are equally distant from the center(s)