1. Warm Up 03.19.12 Week 1

2. Section 10.1 Day 1 I will identify segments and lines related to circles. Circle ⊙ p Circle P P

3. Radius The distance from the center to a point on the circle. Diameter The distance across the circle through the center. Circles are congruent if they have the same radius. Rule 1 Diameters are twice the radius. Rule 2

4. Radius and diameter are both segments and measures. Rule 3 are radii of ⊙ Q. All radii of a circle are congruent. Rule 4

5. a segment whose endpoints are points on the circle. Chord are chords. a chord that passes through the center. diameter is a diameter.

6. a line that intersects a circle at two points. secant Line j is a secant. Line k is a tangent. a line that intersects a circle in exactly one point. tangent

7. Ex 1 Diameter Radius Tangent Chord

8. Tangent Circles Concentric Circles 2 point Circles

9. Do : Textbook Page 599, 9 – 35 all Assignment:

10. Ex 2 a. b.