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One notorious math theorem most adults still recall from their school days, still wondering whether they will ever make use of it in their lives.
While the Pythagorean theorem has psychologically contributed to the suffering of tens of millions of schoolchildren, its role in science and engineering cannot be disputed.
by MathPlus July 10, 2016

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2
1. In geometry, a theorem stating that in a right triangle, the square of the hypotenuse (the longest side) is equal to the sum of the squares of the other two sides (legs). If the hypotenuse is c units long and the lengths of the legs are a and b, then c2 = a2 + b2. The theorem provides a way of calculating the length of any side of a right triangle if the lengths of the other to sides are known.

2. Something the Scarecrow from The Wizard of Oz was unable to correctly state even after he received his brains from the wizard.
-The Pythagorean Theorem? Who needs it? Some smart little preppy kid who's gonna save the world someday?
-Actually you need it to pass this geometry test asshole! If you don't pass this you stay back another year!
by Sid Barrett July 04, 2007

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3
THE MOST AWESOME THEOREM EVER CREATED!
Pythagorean Theorem: a squared plus b squared = c squared
by explodingcan March 19, 2009

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The Pythagorean Theorem states that if Pedestrian A attempts to cross in front of car B at anything less than a 90 degree perpendicular angle, we can conclude that Pedestrian A is getting cut off.
"John (the model citizen) used the Pythagorean Theorem to determine it was faster to cross the road in a straight line, rather than diagonally."
by Dubslar November 08, 2015

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5
The only geometric theorem that will be used in the real world, primarily by tall people figuring out the best way to sleep in short people beds and TV manufacturers trying to find the largest possible number to put on the box.
Student 1: The pythagorean theorem is actually useful!
Student 2: Really? What's the pissgoreporn theorem?
Student 1: I don't fucking know!
by DrumpfForPOTUS July 30, 2016

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