| A | B |
|---|
| CIRCLE | a set of all points in a the center of the circle called the center of the circle |
| INTERIOR | all points inside a circle |
| EXTERIOR | all points outside a circle |
| CHORD | a segment whose endpoints are on the circle |
| DIAMETER | chord that goes through the center |
| RADIUS | a segment that has a center and a point on the circle as its endpoint |
| TANGENT | line that intersects a circle at exactly one point |
| COMMON TANGENT | line that is tangent to 2 circles |
| COMMON EXTERNAL TANGENT | common tangent that doesn't intersect segment connecting centers of the circles |
| COMMON INTERNAL TANGENT | common tangent that does intersect segment connecting centers of circles |
| SECANT | line that intersects a circle at 2 intersection points |
| CENTRAL ANGLE | an angle whose vertex is the center of the circle |
| MINOR ARC | measure of the arc is less than 180 degrees; its the same as the central angle that created it |
| MAJOR ARC | measure of the arc that is greater than 180 degrees |
| SEMICIRCLE | arc whose endpoints are a diameter and its measure is always 180 degrees |
| ARC ADDITION POSTULATE | the measure of an acr formed by 2 adjacent arcs is the sum of the measure of the 2 arcs |
| Theorum10.4...arcs congruent if? | In the same circle or in congruent circles, 2 arcs are congruent iff their central angles are congruent |
| CIRCLES ARE CONGRUENT IF? | circles are congruent iff their radii are congruent |
| Theorum 10.5...two minor arcs are congruent if? | In the same circle or in congruent circles, two minor arcs are congruent iff their corresponding chords are congruent |
| Theorum 10.6...diameter bisects chord and its arc if? | If a diameter of a circle is perpendicular to a chord, then the diameter bisects the chord and its arc. |
| Theorum 10.7...if chord is perpendicular bisector? | If chord is a perpendicular bisector of another chord, then the chord is a diameter of the circle |
| Theorum 10.8...2 chords are congruent if? | In the same circle or in congruent circles, 2 chords are congruent iff they are equidistant from the center |
