A1. Pi is an irrational number. That means that it cannot be expressed as a ratio.
25/8 is a good rough approximation, as is the more common 22/7.
A2. 3.1415926535897932384626433832795 usually shortened to 3.14
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3.141592654.......
The numerical equivalent of centi is .01 or 1/100.
They represent 34
3.1415926535
0.524 or pi/6