Question 3: Recall, ? is defined as the ratio of the circumference (say c/) Chapter 1: Number System Maths Class 9 solutions are developed for assisting understudies with working on their score and increase knowledge of the subjects. Question 3: Recall, π is defined as the ratio of the circumference (say c) of a circle to its diameter (say d). That is, . This seems to contradict the fact that π is irrational. How will you resolve this contradiction? is solved by our expert teachers. You can get ncert solutions and notes for class 9 chapter 1 absolutely free. NCERT Solutions for class 9 Maths Chapter 1: Number System is very essencial for getting good marks in CBSE Board examinations
Question 3: Recall, π is defined as the ratio of the circumference (say c) of a circle to its diameter (say d). That is, 
. This seems to contradict the fact that π is irrational. How will you resolve this contradiction?
Solution: There is no contradiction.. We can never obtain an exact value of c and d so that , either c or d is irrational. and product or division of rational with irrational is always irrational . Therefore, the fraction c/d is irrational. Hence, π is irrational.
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