Properties of Circles

 
5.1  Properties of Circles
 

     
Radius:   A straight line from the centre of the circle to any point on the circumference.
     
Sector:   The region enclosed by two radii and an arc.
     
Segment:   The region enclosed by a chord and an arc.
     
Arc:   Part of the circumference.
     
Diameter:   A straight line that touches the circumference through the centre of the circle.
     
Chord:   A straight line that joins any two points on the circumference.
     
Circumference:   The perimeter of a circle.
     
Centre:   A fixed point where all points on the circumference are equidistance from it.