The ratio of the circumference of a circle to its diameter is a constant, irrespective of the actual measurements. This ratio is called pi and is 3.1415...
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Pi is an Irrational number, which is one of the two subcategories of real numbers.
Yes. For example: pi - pi = 0
Pi is both an irrational number and a transcendental number.
3.141
3.141592348758958749658743295797589468716473892657843758326584365783925482657298365782965823965926587432965728965782782965789265879426364862582647584687592658743926578947265782675436566294587375664378347956784658495277857589075894237502783