So as not to confuse a mathematical constant with a pastry.
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because 3.14 is pie spelled backwards
If you are referring to the number that is used to describe the ratio of a circle's circumference to its diameter, then, yes, in terms of math it is spelled pi. Pi equals out to about 3.141529+ and goes on infinite (never ending).
First of all it is NOT 'pie' . 'Pie' is the foodstuff that you eat e,g, apple pie, meat pie. The Mathemtical 'pi' is spelled as 'pi' and is from the Classical Greek alphabet, and represent the small /lower case letter 'p'. To answer your question. Set your calculator in RADIAN Mode. Sin(pi/3) sqrt(3) /2 = 0.8660254.... NB You will have an incorrect answer if your calculator is set in 'DEGREE' Mode.
pi
~ Pi