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this funny pi day shirt makes a perfect gifts idea for math club students or teachers this March 14. We have pie for studying algebra, geometry, calculus, or trigonometry. If you're a mathlete, have a slice of pie on pi day!.Celebrate a happy Pi Day with this funny mathematics pun tee featuring the greek letter pi used as the mathematical symbol for the irrational number that is the ratio between the diameter and circumference of a circle. Great for maths geeks and nerds..Lightweight, Classic fit, Double-needle sleeve and bottom hem

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