Understanding the Physical Meaning of Pi in a Circle

[Drakkith]

but how the length .142 is exact??

How isn't it?

 

[Drakkith]

but how the length .142 is exact??

How isn't it?

To clarify, I'm asking so that I understand your thinking and level of knowledge on this.

 

[HallsofIvy]

https://www.physicsforums.com/attac...1/?temp_hash=586afacbbfb47e99be368397d4138bd7.
can somebody explain me the measurement of last part of the circle i.e .3142 and so on.
means what is the exact measurement of that last part?

All I see in your picture is a circle with the diameter marked (but numerical value given) and a small section marked off, labeled ".14159...". There does not seem to be any reason given for that section to be marked or any explanation of what that means. I might guess that the ".14159", simply because it is the first 5 decimal places $\pi$, is supposed to be the decimal part of $\pi$, $3- \pi$ but I have no idea what it is really intended to show

 

[ProfuselyQuarky]

but how the length .142 is exact??

0.14159 (and so on) is a definite number between 0 and 1. Just because there's a decimal, it doesn't mean that it's not "real" or that it's "infinite" like you've said along this thread.