**From New Scientist #1513, 19th June 1986** [link]

“We Yorkshireman,” said my friend Triptolemus, “like a puzzle as a cure for insomnia, instead of counting sheep. Have you got a nice simple question, without a mass of figures to remember?”

So I said, “If a wrong-angled triangle has whole-number sides and an area equal to its perimeter, how long are its sides?”

He slept on the the problem and gave me the answer next morning.

Can you?

(A wrong-angled triangle is of course the opposite of a right-angled triangle. Instead of two of its angles adding up to 90°, it has two angles *differing* by 90°).

There are now 1000 *Enigma* puzzles on the site, with a full archive of puzzles from **Enigma 1** (February 1979) up to this puzzle, **Enigma 364** (June 1986) and also all puzzles from **Enigma 1148** (August 2001) up to the final puzzle **Enigma 1780** (December 2013). Altogether that is about 56% of all the *Enigma* puzzles ever published.

I have been able to get hold of most of the remaining puzzles up to the end of 1989 and from 2000 onwards, so I’m missing sources for most of the puzzles originally published in from 1990 to 1999. Any help in sourcing these is appreciated.

[enigma364]

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