Things you remember from school but have never used

[Spidey66]

I left 40 years back, but to this day remember that the square of the hypotenuse on a right angle triangle is equal to the sum of the squares on the other 2 sides aka Pythgoras thereom. I have never used this gem of information in my life.

I also remember "it is a truth universally acknowledged that a single man in possession of a large fortune must be in want of a wife" (the first line of Pride and Prejudice, which I read for O Level English Lit.) Tbf I enjoyed the book and the TV series (not so much the film) but funnily enough have not read another Jane Austen book!

Any other gems you remember?

Hypotenuse, SOHCAHTOA, ox bow lakes and matrices - I need knowledge of these most days, because of what I do for a living.

Conjugation of French verbs in umpteen tenses, structure of a cell - never

Willie, Willie, Harry, Ste,
Harry, Dick, John, Harry Three,

Edward One, Two, Three, Dick Two,
Henry Four, Five, Six, then who?

Edward Four, Five, Dick the Bad,
Harrys twain and Ned, the lad.
Mary, Lizzie, James the Vain,
Charlie, Charlie, James again.

William and Mary, Anne o'Gloria,
Four Georges, William and Victoria.

Edward Seven, Georgie Five,
Edward, George and Liz (alive)

After Liz, who's it to be?
The next in line is Charlie Three
But if he is not then alive
The next in line is Willie Five.

Pythagoras theory. The poor laws (hedge schools?).

Little Betty Boron Can Not Offer Flowers

Im sure it’s useful for something….

My knowledge of the chemical formula of Ecstacy recently came in useful in playing Cemantle. I haven't needed that since Yr10...

Technical drawing! I have not been asked to draw a front or side elevation of a grey plastic 3D shape for about 35 years, but I bet I could have a good go with a T square and a set square. (Yes, I did just check on google that I was using the right terms, shuddup.)

The fucking recorder

I'm sure I do remember lots of what we did, and I got good GCSE results, but I can't for the life of me think of anything specific other than in Year 7 I was taught that rhythm can be spelled correctly by remembering 'rhythm has your two hips moving' and every time I ever need to spell that word I say that in my head!

Types of rock. I have yet to find a practical use of my ability to identify an igneous rock

Glacier formation.
To use the Spanish phrase Sinverguenza
To sing grace in Latin before a meal.
Coefficient of friction.

@IbizaToTheNorfolkBroads are you a supply teacher in a secondary school?