Above, a 1934 plaque from the Big Apple Night Club at West 135th Street and Seventh Avenue in Harlem. Discarded as trash in 2006. Now a Popeyes fast food restaurant on Google Maps.

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Entry from November 16, 2017
“How did the math teacher kill himself?”/“He used a hypotenuse.”

There isn’t a “noose” in “hypotenuse,” but this math riddle was posted on Twitter on May 13, 2013:

Q: How did the math professor kill himself?
A: He used a hypotenuse.

A slightly different version was posted on Twitter on August 28, 2014:

Q: How did the triangle kill himself?
A: He used a hypotenuse.

Wikipedia: Hypotenuse
In geometry, a hypotenuse (rarely: hypothenuse) is the longest side of a right-angled triangle, the side opposite of the right angle. The length of the hypotenuse of a right triangle can be found using the Pythagorean theorem, which states that the square of the length of the hypotenuse equals the sum of the squares of the lengths of the other two sides. For example, if one of the other sides has a length of 3 (when squared, 9) and the other has a length of 4 (when squared, 16), then their squares add up to 25. The length of the hypotenuse is the square root of 25, that is, 5.

Pope of Chili Town‏
@Chili_Pope80
How did the Math Professor kill himself?
He used a hypotenuse…
*rimshot*
10:53 AM - 13 May 2013

Megan DeSalvo‏
@megandesa
How did the triangle kill himself?
He used a hypotenuse 😂😂😂
6:32 PM - 28 Aug 2014

Jacob Crick ⚡️‏
@CrickJacob
Math teacher hung himself…..he used a hypotenuse.
3:57 PM - 27 Aug 2015

Kent_M‏
@Sir_Kent_M
Lets start the morning off dark; how’d the triangle kill itself? It used a hypotenuse
3:59 AM - 22 Mar 2016

Reddit—Jokes
How did the triangle kill itself?
submitted November 16, 2017 by greenpeppers100
It used a hypotenuse.
SevereHyperbole
I should have seen the sine.