Chord {Ans: a line segment whose endpoints lie on the circle}Radius {Ans: The distance from the center of a circle to any point on the circle.}Minor arc {Ans: An arc measuring less than 180 degrees}Point of Tangency {Ans: Where the tangent line meets a perpendicular radius of a circle.}Major arc {Ans: An arc measuring more than 180 degrees}Tangent {Ans: A line that intersects a circle in exactly one point}Diameter {Ans: the distance across a circle through its center (aka the longest chord)}Congruent {Ans: The measure of a central angle and it's corresponding arc are ___________.}Semi-circle {Ans: An arc equal to half the total circumference of a circle}Circle {Ans: The set of all points in a plane that are the same distance from a given point called the center}Sector of a Circle {Ans: A fractional part of the total are of a circle}Central Angle {Ans: an angle whose vertex is the center of the circle}