Circles are round figures whose boundaries are equidistant from the circle.
To construct a circle, the round boundaries of the circle must have the same distance from the center of the circle.
The distance between these sides and the center is the radius
(a) One point common
This means that circles A and C only have a point of intersection
See attachment for the circle of this illustration
(b) No point common
This means that circles A and C only have no point of intersection
See attachment for the circle of this illustration
(c) Two points common
This means that circles A and C only have two points of intersection
See attachment for the circle of this illustration
(d) More than two points common
This means that circles A and C are the same circle, and they have the same radius
i.e. [tex]\mathbf{AB = CD}[/tex]
See attachment for the circle of this illustration
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