the ratio of circumference to the diameter of a circle c/d is represented by pi but we say pi is a irrational number ...why
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the decimal expansion of irrational numbers are also defined as non terminating and non repeating.If you do the decimal expansion of c/d it will be 3.142857142857142857...
the expansion will be endless
thus decimal expansion of c/d is non terminating and non repeating therefore it is an irrational number.
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