Question 767659
4πrē in this why we use 4 and π ? And also we use1/3, 3/4 in other formula why we can not use the any think like 5/4, 8/3 
------------
It's not clear what you're asking.
We do use 5/4 & 8/3 when appropriate.
------
In the case of 4pi*r^2, that's the surface area of a sphere of radius r.
We use {{{4pi*r^2}}} because that's what it is.