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# Circles

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### Circles

1. 1. CIRCLES<br />
2. 2. Definitions<br /> pg 293 <br />A circle is the set of all points in a plane equidistant from a given point, called the center.<br />B<br />r<br />O<br />r<br />r<br />C<br />A<br />
3. 3. Definitions<br /> pg 293 <br />A secant of a circle is a line that intersects the circle in two points.<br />A chord of a circle is a segment whose endpoints lie on the circle.<br /><ul><li>In the figure, AB is a chord.
4. 4. Thus, every secant contains a chord.</li></ul>B<br />A<br />
5. 5. Definitions<br /> pg 293 <br />A diameter of a circle is a chord containing the center. It is the longest chord.<br />A radius of a circle is a segment from the center to a point on the circle.<br />radius<br />Radius = AO<br />O<br />A<br />B<br />Diameter = AB<br />diameter<br />What is the relationship between a radius and a diameter?<br />
6. 6. Identify if the following is a radius, diameter, or chord.<br />BC<br />EI<br />FJ<br />GD<br />GF<br />IF<br />FH<br />DA<br />MK<br />FM<br /><ul><li> chord
7. 7. diameter
9. 9. diameter
13. 13. chord
14. 14. diameter
15. 15. radius</li></li></ul><li>Identify if the following is a radius, diameter, or chord.<br />AD<br />GF<br />EG<br />GN<br />BM<br />GL<br />KL<br />GK<br />EK<br />GB<br /><ul><li> chord
19. 19. diameter
21. 21. chord
23. 23. diameter
24. 24. radius</li></li></ul><li>Identify if the following is a radius, diameter, or chord.<br />JH<br />TX<br />CL<br />GD<br />EH<br />MN<br />VC<br />NL<br />KP<br />CQ<br /><ul><li> chord
25. 25. diameter