| A | B |
|---|
| A Segment whose endpoints lie on a circle | Chord +1 |
| A line that contains a chord | Secant +1 |
| A chord that contains the center of the circle | Diameter +1 |
| A line in the plane of a circle that intersects that circle in exactly one point | Tangent +1 |
| Circles that lie in the same plane and have the same center | Concentric Circles +1 |
| Tangents to a circle from a point are _____ | Congruent +2/-1 |
| An angle whose vertex is on a circle and whose sides contain the chords of the circle | Inscribed Angle +2/-1 |
| If a line in the plane of a circle is perpendicular to a radius at its outer endpoint, then the line is tangent to the _____ | Circle +2/-1 |
| When each side of a polygon is tangent to a circle, the polygon is said to be _____ about the circle | Circumscribed +2/-1 |
| A line that is tangent to each of two coplanar circles is called a ______ | Common Tangent +2/-1 |
| A _____ of a circle is an angle with its vertex at the center of the circle | Central Angle +3/-2 |
| The measure of a _____ is defined to be the measure of its central angle | Minor Arc +3/-2 |
| ______ of a circle are arcs that have exactly one point in common | Adjacent arcs +3/-2 |
| The measure of a semicircle is _____ | 180 degrees +3/-2 |
| ____ are arcs in the same circle, or in congruent circles that have equal measures | Congruent arcs +3/-2 |
| A diameter that is ____ to a chord bisects the chord and its arc | Perpendicular +4/-3 |
| The measure of an angle formed by a chord and a tangent is equal to _____ the measure of the intercepter arc | Half +4/-3 |
| In congruent circles congruent arcs have _____ chords | Congruent +4/-3 |
| In congruent circles, congruent chords have ______ arcs | Congruent +4/-3 |
| An angle inscribed inside a semicircle is a _______ | Right Angle +4/-3 |
| If a quadrilateral is inscribed in a circle, then its opposite angles are supplementary | Supplementary +5/-4 |
| The measure of an angle formed by two secants, two tangents, or a secant and a tangent drawn from a point outside a circle is equal to ______ | Half the difference of the measures of the intercepted arcs +5/-4 |
