Of this abstraction. The values for getRadius() or getCircumference() in the above mentioned illustration could possibly be saved right, or they could be calculated, it doesn't make a difference towards the caller; the setters may possibly or might not have Unwanted effects; it would not subject towards the caller. See https://propertyingurugram.in/1500-acres-allotted-to-it-industry-in-imt-sohna/