**A circle’s domain is defined as the X coordinate of the circle’s centre plus and minus the radius of the circle. A circle’s range is equal to the Y coordinate of the circle’s centre plus and minus the radius of the circle.** Because X is alphabetically before Y and domain is alphabetically before range, it’s easy to recall which coordinates domain and range correspond to.

The usual version of the circle formula is (x – a)2 + (y – b)2 = r2, where “a” is the X coordinate of the circle’s centre, “b” is the Y coordinate of the circle’s centre, and “r” is the circle’s radius. The radius is the square root of the integer to the right of the equal sign, and the centre of the circle has coordinates (a,b). x| a – r x a + r is the formula for the domain of a circle. The formula for calculating a circle’s range is y| b – r y b + r.

The domain specifies the maximum and minimum values for the circle’s X coordinates, while the range specifies the maximum and minimum values for the circle’s Y coordinates. The domain and range of the circle contain all of the values of the circle’s points.

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