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When we measure any circumference or diameter by the scale then we get the approximate rational numbers , these are not 100% accurate. Again for the minimum change in the measurement of circumference , it makes a change in the length of the diameter.
Hence , between c & d which one is the irrational we cannot understand so easily.
Generally we write π= 22/7 , but 22/7 is not the accurate value of π.
Though we write , π=c/d , but π is an irrational number.
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