Because hippos are surprisingly dangerous, zoologists use the Pythagorean theorem to calculate the length of their backs.
This is called finding the hippotenuse.
The Pythagorean Theorem, Newton's Third Law and Bernoulli's Principle walk into a bar.
The bartender says, "I'm not going to get this joke aren't I?"
Three Squaws Were Each Preparing For The Birth Of Their First Child.
Three squaws were each preparing for the birth of their first child. The first squaw placed a large bear hide by a river, the second squaw placed an elk hide by a tree by a river, and the third squaw placed a hippopotamus hide by a path, near the river and the tree so that the three form...
So 3, 4, and 5 fell down a flight of stairs...
Now they're a Pythagorean cripple.