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Pythagorean Theorem White T-Shirt w/back "got proof?" - a geometric proof of the Pythagorean Theorem. Front and Back. For the math nerd or math teacher. $21.95 Size:  Size Chart Small Medium Large X-Large 2X-Large (+$3.00) 3X-Large (+$3.00) 4X-Large (+$3.00) Qty:    AVAILABILITY: Product Number: 49912003 Product Information Fit: Standard Not too tight, not too loose. Fabric Thickness: The most comfortable t-shirt ever! Our 100% cotton, Hanes Authentic Tagless T-Shirt is preshrunk, durable and guaranteed. 6.1 oz. 100% cotton Standard fit