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Pi Day, Sweet As Pi, Funny Math Teacher, Mathematics Student T-Shirt Acadia National Park Travel Journey Explore Earth T-Shirt Retro Aloha State Tropic IslandsSweet As Pi Math Pun Design That Uses The Irrational Number, Pi, As A Stand In For The Word, Pie. Best Gift For Your Teacher, Child Or Student Or For A Math Event. Funny Math Teacher Design Makes The Best Gift For Anyone With A Love Of Math, Geometry, Or Algebra! Fun For Mathematicians To Wear On Pi Day. Order Yours Now! Lightweight, Classic Fit, Double Needle Sleeve And Bottom Hem Solid Colors: 100% Cotton; Heather Grey: 90% Cotton, 10% Polyester;