UPSKILL MATH PLUS

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1The region enclosed by the chord and the arc of the circle is called the  .
 
2If a point lies on the circle, then the distance between the point and the centre is  the radius of the circle.
 
3The number of circles that can pass through three non-collinear points is.
  
4. In a polygon, the boundary is denoted by the term perimeter whereas in a circle the boundary is denoted by the term .