1. Pg 603

2.  An angle whose vertex is the center of the circle

3.  Minor Arc  CB  Major Arc  BDC  Semicircle  Endpoints of the arc are a diameter

4.  Minor Arc  The measure of the central angle  Major Arc  360 – minor arc  Congruent Arcs  Have the same measure

5.  MN  80 °  MPN  360 – 80 = 280 °  PMN  180 °

6.  The measure of an arc formed by two adjacent arcs is the sum of the measures of the two arcs.  mABC = mAB +mBC

7.  GE  40 + 80 = 120 °  GEF  120 + 110 = 230 °  GF  360 – 230 = 130 °

8.  In the same circle, or in congruent circles, two minor arcs are congruent if and only if their corresponding chords are congruent.  if and only if

9.  If a diameter of a circle is perpendicular to a chord, then the diameter bisects the chord and its arc. 

10.  If one chord is a perpendicular bisector of another chord, then the first chord is a diameter.

13.  In the same circle, or in congruent circles, two chords are congruent if and only if they are equidistant from the center.

14.  CD = 10