Problem 2022. Find a Pythagorean triple

Created by Tanya Morton

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Given four different positive numbers, a, b, c and d, provided in increasing order: a < b < c < d, find if any three of them comprise sides of a right-angled triangle. Return true if they do, otherwise return false .

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Last Solution submitted on Oct 10, 2025

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Jean-Marie Sainthillier on 13 Dec 2013

See Problem 1550 Can I make a right triangle ?

Justin Illingworth on 22 Oct 2019

Thanks Tanya, have enjoyed these.

George Iskander on 18 Feb 2020

if (a==2|a==3)
flag=true;
end
The cases are very limited to make such a code valid

Lkhagvasuren Byambadorj on 27 Oct 2020

Thanks, enjoyed these.

Parry on 11 Dec 2022

I really liked this problem!

Minh Lan on 20 Feb 2023

niceee

Shahriar Kabir on 19 Mar 2023

brainstormed

Josh on 17 Jul 2023

any insight into handling the case where one of the side lengths is irrational and rounding error in the approximation causes a false negative to be returned?

for example - Test 7

Gairik Sarkar on 17 May 2024

roundup the numbers before comparing

Sophia on 28 May 2024

I think for Test-7 , problem creator @Tanya should add "~" to the "flag_correct" part of the line:

assert(isequal(isTherePythagoreanTriple(a, b, c, d),flag_correct))

so it should be changed to :
assert(isequal(isTherePythagoreanTriple(a, b, c, d),~flag_correct))

Sunil on 20 Jun 2024

Pythagorean triplets are taken as positive integers , one of the test case uses irrational number for inputs ! I wish the test creator
@Tanya Morton makes appropriate change as suggested by @Sophia

Alexander on 2 May 2025

yeah took me a minute to figure out the rounding bit

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Problem 2022. Find a Pythagorean triple

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Problem 2022. Find a Pythagorean triple

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