Question

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what is the relation b\w pi and circle

Answer 1

The circumference of a circle is found by the relation or where d is the diameter of the circle and r is the radius of the circle.

So the circumference of a circle is directly proportional to the diameter, with the constant of proportionality .

Answer 2

pi is nothing but used as the ratio of it bend arcs in general we take 4 arcs in the basic level
actual value of pi is not defined yet since it is an irrational no.
till now only till 15trillion decimal place was discovered with the help of a identity of. s ramanugan