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space to change slides this project is an explanation to why it is called "super" pi day! happy pi day everyone! okay, so you may not get the joke in there. the square root of a negative number is called an imaginary number. an imaginary number in math is resembled as i. 2^3=8 and that weird backwards e thing means sum. so, saying the sentence out loud would make you say "I ate (8) some (sum) pie, and it was yummy!