1 because anything other than 0, divided by itself is 1.
"One", if you divide any number by the same number, it will equal "one".
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Spelling makes it hard to be sure what the question is (though I see it's filed under "baking"), so I'll try to address the major variations:
Pi divided by pi is 1.
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Pi divided by thirty two. .0981747704
25/pi = 7.957747155
the same as pi squared, which is 9.86960440109
there is no equation of Pi Circumference divided by diameter
No two numbers that can be completely written down with digits can be added, subtracted, multiplied, or divided to equal PI. If they could be divided to equal PI, then PI would be a rational number. But it isn't.