1. Main Idea 1: If the arcs are congruent, then the chords are congruent. REVERSE: If the chords are congruent, then the arcs are congruent. Main Idea 2: If the chords are equidistant from the center of the circle, then the chords/arcs are congruent. REVERSE: If the chords/arcs are congruent, then the chords are equidistant from the center of the circle Arcs and Chords

3. Main Idea 3: If the radius/diameter is perpendicular to the chord, then it bisects both the chord and the arc. REVERSE: The perpendicular bisector of a chord is the radius/diameter. Arcs and Chords **If you draw a second radius from the center to the endpoint of the chord, you create a right triangle and can use Pythagorean Theorem. **

4. Arc Length, Sector Area, Segment Area