math

• Circle


  The set of all points in a plane at a given distance (radius) from a given point (center) in the plane. It is named by its center.
• Radius


  • A segment from the center to any point of the circle that joins the center and a point on the circle
• Chord


  • A line segment whose endpoints lie on the circle
• Diameter


  • A chord containing the center
• Secant


  • A line that intersects the circle in two points
• Tangent


  • A line lying on the same plane that intersects the circle at exactly one point
• Congruent circles


  Two or more circles having the equal radius
• Concentric circles


  Two or more coplanar circles sharing the same center
• Arc


  • Two points on the circle and the continuous part of the circle between the two points
• Semicircle


  An arc of a circle whose endpoints are the points of the diameter
• Minor arc


  An arc smaller than a semicircle
• Major arc


  An arc larger than a semicircle
• Central angle


  • An angle whose vertex is the center of the circle
• Inscribed angle


  • An angle whose vertex is on the circle and whose sides contain chords of the circle
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