By using basic definition of circle we got that a point is on a circle if the distance from the centre of the circle to the point is equal to the radius.
A circle is a shape of all those points that are at same fixed distance from a given fixed point . that fixed point is called centre and fixed distance is called radius of circle .
Now we know that if a point is inside circle then it's distance from centre must be less than radius and if a point is outside circle then it's distance from centre must be more than radius and if a point is on the circle then it's distance from centre must be equal to radius .
By using basic definition of circle we got that a point is on a circle if the distance from the centre of the circle to the point is equal to the radius.
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