Math

• Circle


  The set of all points in a plane equidistant from a given point in the plane known as the center of the circle
• Center


  The given point in the plane from which all points on the circle are equidistant
• Radius


  • A segment whose endpoints are the center and a point on the circle
• "Circle O"


  A circle named by its center
• Chord


  • A segment whose endpoints lie on a circle
• Diameter


  • A segment containing the center of the circle and whose endpoints are points on a circle
• Diameter


  The longest chord in a circle and twice the length of a radius
• Secant


  • A line intersecting the circle at two points
• Tangent


  • A line intersecting the circle at exactly one point, the point of tangency
• Sector


  The part of a circle enclosed by two radii of a circle and an arc
• Semicircle


  One of the two parts into which a circle is divided by two distinct points on the circle, when the endpoints of the arcs are also endpoints of a diameter
• Minor arc


  The smaller of the two arcs formed when two distinct points divide a circle, when the endpoints are not endpoints of a diameter
• Major arc


  The larger of the two arcs formed when two distinct points divide a circle, when the endpoints are not endpoints of a diameter