1. 12.1 Tangent lines
-Theroem 12.1: if a line is tangent to a circle, then it will be perpendicular to the radius at the point of tangency
-Theroem 12.3: if 2 tangent
Segments to a circle share a
Common endpoint, then the
Segments are congruent

2. 12.2 Chords and arcs
-Theroem 12.4: congruent central angles within a circle have congruent arcs
-Theroem 12.5: congruent
central angles within a circle
have congruent chords

3. 12.2 Chords and arcs
-Theroem 12.6: congruent chords have congruent arcs
-Theroem 12.7: chords
Equidistant from the center
Of a circle are congruent

4. 12.2 Chords and arcs
-Theroem 12.8: if the diameter of a circle is perpendicular to a chord, then it bisects the chord
-Theroem 12.10: the
Perpendicular bisector
Of a chord contains the
Center of the circle

5. 12.3 inscribed angles
-Theroem 12.11: the measure of an inscribed angle is half the measure of the intercepted arc
-Theroem 12.11: two inscribed
Angles that intercept the same
Arc are congruent

6. -Theroem 12.11: an angle inscribed in a semicircle is a right angle
12.3 inscribed angles
-Theroem 12.11: an angle inscribed in a semicircle is a right angle

7. 12.3 inscribed angles
-Theroem 12.11: the measure of an angle formed by a tangent and a
Chord is half the measure of
The intercepted arc

8. 12.4 Angle measures and segment lengths
-Theroem 12.13: the measure of an angle formed by 2 lines intersecting inside a circle is half sum of 2 intercepted arcs

9. 12.4 Angle measures and segment lengths
-Theroem 12.14: the measure of an angle formed by 2 lines intersecting outside a circle is half difference of 2 intercepted arcs

10. 12.4 Angle measures and segment lengths
-Theroem 12.15: the measure of circle segments

11. 12.5 circles

12. 13.1 experimental and theoretical probability
-Probability: value 0 – 1; the number of favorable outcomes over number of possible outcomes
-Experimental Probability: the number of times an event occurs over the number of times an experiment is done

13. 13.3 permutations and combinations
-Permutation: an arrangement of counted items in which order matters
-Combination: an arrangement of counted items in which order does not matter