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Pythagorean Theorem w/back Men's Sleeveless Tee "got proof?" - geometric proof of the Pythagorean Theorem. Front and Back. For the math nerd or math teacher. $20.95 Size:  Size Chart Medium Large X-Large Qty:    AVAILABILITY: Product Number: 49912347 Product Information Fit: Standard Not too tight, not too loose. Fabric Thickness: Beat the summer heat or workout in comfort. Our 100% cotton sleeveless tee from Anvil is what to wear when you want to go casually cool. 6.1 oz. 100% cotton Standard fit