why should we pi as only 3.14 or 22/7???????? why we should not pi as 3.15 or 33/7 or something else??????????????

Because the definition of pi started from the circle:
When the measure of the circumference of any circle is divided by its diameter, the result was always same. This ratio was named pi
So, it is obvious that the circumference will be expressed in terms of pi

for example if you draw a circle and measure its diameter and circumfrence by a thread and a scale .if we divide the circumferce by diameter we will get pi.

if c=350cm and d=111.4084

c/d=22/7

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