Circle: Set of all points in a plane equidistant from a given point called the center.
Radius>: center to a point on the circle.
Diameter: Point on the circle to another point on the circle through the center. Diameter is 2r(radius).
Central Angle: an angle whose vetex is the center of the circle. It has the same measures as the intercepted arc.
Arc: Part of the circle. You use to are 3 letters to name the arc.
Semicircle: 180 degrees(Half of a circle). You name it by using 3 letters. They must include the endpoints of the diameter.
Example: Semicircle AEB or Arc AEB.
Minor Arc: less than 180 degrees. You use 2 letters to name the arc.
Major Arc: more than 180 degrees. You use 3 letters to name the arc.
What is a major arc?
more than 180 degrees. You use 3 letters to name the arc. a>