Bell Ringer – Tuesday, May 5, 2015 Write an example of each of the following: Radius ____ Secant ____ Tangent ____ Chord ____ Diameter ____ Minor arc ____ Major arc ____ Central angle ____ Inscribed angle ____ Center ____

Quick Review of Definitions Circles Quick Review of Definitions

Chord a segment whose endpoints lie on a circle A B AB

Arc an unbroken part of a circle

Minor Arc an arc that is less than half of a circle to name, use 2 points

Major Arc an arc that is more than half of a circle to name, use 3 points

Central Angle an angle whose vertex is at the center of a circle

Inscribed Angle an angle whose vertex is on a circle and whose sides are chords of the circle

Tangent a line, ray, or segment that is in the same plane as the circle, but intersects the circle in only one point

Secant a line, ray, or segment that contains a chord

Arc Length and Area of a Sector There are two ways to determine Arc Length and Area of a Sector. 1. Realize everything is proportional when it comes to circles. 2. See link to Cool Math Examples: p.695-696 # 14-17, 22, 24, 27