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Go to the following link which will give you a better understanding of a circle.
Click on the following link: http://www.mathopenref.com/
Follow the following paths:
Plane Geometry > Circles and Arcs > Circles > Circle - definition
Plane Geometry > Circles and Arcs > Circles > Radius
Plane Geometry > Circles and Arcs > Circles > Diameter
Plane Geometry > Circles and Arcs > Circles > Circumference
Plane Geometry > Circles and Arcs > Circles > Pi
Plane Geometry > Circles and Arcs > Circles > Area of a circle
Plane Geometry > Circles and Arcs > Circles > Annulus
Plane Geometry > Circles and Arcs > Circles > Area of an Annulus
Plane Geometry > Circles and Arcs > Circles > Chord
Plane Geometry > Circles and Arcs > Circles > Tangent
Plane Geometry > Circles and Arcs > Circles > Secant
Plane Geometry > Circles and Arcs > Circles > Intersecting Chords Theorem
Plane Geometry > Circles and Arcs > Circles > Intersecting Secants Theorem
Plane Geometry > Circles and Arcs > Circles > Concentric circles
Plane Geometry > Circles and Arcs > Circles > Incircles
Plane Geometry > Circles and Arcs > Circles > Circumcircles
Plane Geometry > Circles and Arcs > Parts of a Circle > Semicircle
Plane Geometry > Circles and Arcs > Parts of a Circle > Sector of a Circle
Plane Geometry > Circles and Arcs > Parts of a Circle > Segment of a circle
Plane Geometry > Circles and Arcs > Parts of a Circle > Area of a Segment
Plane Geometry > Circles and Arcs > Angles in a Circle > Inscribed Angle
Plane Geometry > Circles and Arcs > Angles in a Circle > Central Angle
Plane Geometry > Circles and Arcs > Angles in a Circle > Central Angle theorem
Plane Geometry > Circles and Arcs > Angles in a Circle > Thales' Theorem
Plane Geometry > Circles and Arcs > Angles in a Circle > Angle inscribed in a semicircle
Plane Geometry > Circles and Arcs > Arcs > Arc definition
Plane Geometry > Circles and Arcs > Arcs > Major and Minor Arcs
Plane Geometry > Circles and Arcs > Arcs > Arc length
Plane Geometry > Circles and Arcs > Arcs > Adjacent arcs
Plane Geometry > Circles and Arcs > Arcs > Intercepted Arc
Plane Geometry > Circles and Arcs > Arcs > Radius of an Arc or Segment
Plane Geometry > Circles and Arcs > Finding the Center of a Circle > Finding the center with compass and ruler
Plane Geometry > Circles and Arcs > Finding the Center of a Circle > Finding the center with any right-angled object
Follow the following paths:
Plane Geometry > Circles and Arcs > Circles > Circle - definition
Plane Geometry > Circles and Arcs > Circles > Radius
Plane Geometry > Circles and Arcs > Circles > Diameter
Plane Geometry > Circles and Arcs > Circles > Circumference
Plane Geometry > Circles and Arcs > Circles > Pi
Plane Geometry > Circles and Arcs > Circles > Area of a circle
Plane Geometry > Circles and Arcs > Circles > Annulus
Plane Geometry > Circles and Arcs > Circles > Area of an Annulus
Plane Geometry > Circles and Arcs > Circles > Chord
Plane Geometry > Circles and Arcs > Circles > Tangent
Plane Geometry > Circles and Arcs > Circles > Secant
Plane Geometry > Circles and Arcs > Circles > Intersecting Chords Theorem
Plane Geometry > Circles and Arcs > Circles > Intersecting Secants Theorem
Plane Geometry > Circles and Arcs > Circles > Concentric circles
Plane Geometry > Circles and Arcs > Circles > Incircles
Plane Geometry > Circles and Arcs > Circles > Circumcircles
Plane Geometry > Circles and Arcs > Parts of a Circle > Semicircle
Plane Geometry > Circles and Arcs > Parts of a Circle > Sector of a Circle
Plane Geometry > Circles and Arcs > Parts of a Circle > Segment of a circle
Plane Geometry > Circles and Arcs > Parts of a Circle > Area of a Segment
Plane Geometry > Circles and Arcs > Angles in a Circle > Inscribed Angle
Plane Geometry > Circles and Arcs > Angles in a Circle > Central Angle
Plane Geometry > Circles and Arcs > Angles in a Circle > Central Angle theorem
Plane Geometry > Circles and Arcs > Angles in a Circle > Thales' Theorem
Plane Geometry > Circles and Arcs > Angles in a Circle > Angle inscribed in a semicircle
Plane Geometry > Circles and Arcs > Arcs > Arc definition
Plane Geometry > Circles and Arcs > Arcs > Major and Minor Arcs
Plane Geometry > Circles and Arcs > Arcs > Arc length
Plane Geometry > Circles and Arcs > Arcs > Adjacent arcs
Plane Geometry > Circles and Arcs > Arcs > Intercepted Arc
Plane Geometry > Circles and Arcs > Arcs > Radius of an Arc or Segment
Plane Geometry > Circles and Arcs > Finding the Center of a Circle > Finding the center with compass and ruler
Plane Geometry > Circles and Arcs > Finding the Center of a Circle > Finding the center with any right-angled object