CHAPTER+9+LINK

__CHAPTER 9.1 CHORDS AND ARCS [[image:http://farm1.static.flickr.com/164/363989684_c960c67d8b_o.jpg width="250" height="302"]]__
OBJECTIVES- -Define a circle and its associated parts, and use them in contructions. -Define and use the degree measure of arcs. -Define and use the length measure of arcs. -Prove a theorem about chords and thier intercepred arcs.

__Circle-__ A circle is the set of all points in a plane that are equidistans from a given point in the plane known as the center circle. __Central Angle__- A central angle of a cirlce is and angle in the plane of a circle whose vertex is the center of the circle. __Intercepted Arc-__ An arc whose endpoints lie on the sides of the angle ans whose other points lin in the interior of the angle. __Degree Measure of Arcs-__ The degree measure of a minot arc is the measure of its central angle. The degree measure of a major arc is 360 minus the degree measure of its minor arc. The degree measure of a semicircle is 180 __Arc Length-__ r = radius m = degree measure of an arc L = length of the arc

L = m/360(2pier)