Recall, π is defined as the ratio of the circumference (say c) of a circle to its diameter (say d). That is, π= c/d. This seems to contradict the fact that πis irrational. How will you resolve this contradiction?

With a scale or tape we get only an approximate rational number as the result of our measurement. That is why n can be approximately represented as a quotient of two rational numbers. As a matter of mathematical truth it is irrational.