'pie' is the food that you eat , such as apple pie, or meat pie.
However, I think you mean 'pi' Note the spelling.
'pi' is the small case letter 'p' from the Classical Greek Alphabet, and refers to ( the constant of ) 'proportion' , that is the proportion between a circles circumference and its diameter.
C = pi*d
pi is an irrational number, which means the decimal digits go to infinity, AND are not in any regular order.
However, for everyday school/working purposes , pi = 3.1416
So half a 'pi' is pi/2 = 3.1416/ 2 = 1.5708
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40 (one man can eat one pie in a minute and a half)
tan (pi) / 1 is zero. tan (pi / 1) is zero.
A half is bigger than a third.
half of a sixtieth...
C=2(pie)R i.e. C=2(3.141)1 C=6.282cm