CIRCLE

• Circle


  A closed curve, all points of which are equidistant from a fixed point called the center

  named by their centers using CAPiTAL LETTERS
• Radius


  A segment whose one endpoint is in the center of the circle and the other endpoint is any point on the circle

  Endpoints are the center and anypoint in the circle

  it is half of a diameter

  plural form is called the "radii"
• Diameter


  A chord which passes through the center of the circle. It is twice the length of a radius

  it is a segment whose endpointsare any two points on the circle and PASSES THROUGH THE CENTER

  LONGEST CHORD
• Chord


  A segment whose endpoints are any of two different points in the circle
• Secant


  A line that contains a chord

  it is a line that intersects the circle at two points
• Tangent is the line that touches the circle at exactly one point called "the point of tangency."
• Central angle


  An angle formed by two rays whose vertex is the center of the circle. Each ray intersects the circle at a point, dividing it into arcs

  Is an angles whose vertex is the center of the circle and sides are two radii
• Arc


  A part or a portion of a circle
• Semicircle


  An arc with a measure equal to one-half the circumference of a circle
• Circles are named by their centers using capital letters
• All radii of a circle are equal in measures
• All diameters of a circle have equal measures
• Central angle


  An angle formed by two rays whose vertex is the center of the circle. Each ray intersects the circle at a point, dividing it into arcs.
• Minor arc


  An arc of the circle that measures less than a semicircle
• Major arc


  An arc of the circle that measures greater than a semicircle
• Inscribed angle


  An angle whose vertex lies on a circle and its two sides are chords of a circle. The arc that lies in the interior of an inscribed angle and has endpoints on the angle is called the intercepted arc.

  • Is an angle whose vertex is a point on a circle and sides are two chords.
• A circle is a closed curve, all points of which are equidistant from a fixed point called the center.
• A tangent is a line in the plane of a circle that intersects the circle at exactly one point, called the point of tangency.
• A diameter divides the circle into two equal parts.
• A secant contains a chord.
• A tangent passes through the center of a circle.
• Minor arc


  An arc less than half a circle
• Minor arc


  • Less than 180 degrees