Problem 2023. Is this triangle right-angled?

Created by Tanya Morton

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Given any three positive numbers a, b, c, return true if the triangle with sides a, b and c is right-angled. Otherwise, return false.

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15004 Solutions
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Last Solution submitted on Jan 09, 2026

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Shravankumar P on 18 Jun 2014

among a,b,c., specify the hypotenuse.

Flo Mo on 22 Sep 2016

that's the tricky part here ;) Check all combinations - too bad 'combvec' doesnt work here

Bunny Harlan on 25 Oct 2017

Passes for True, but Failing when I get to false test?? Not sure at the moment what I could be missing.

pwl on 31 Jan 2023

I'd like to suggest an additional test case such as
a = sqrt(10); b = 3; c = 1;
Here the result is "true", but some of the existing solutions won't work because of rounding errors.

Adam on 8 Dec 2023

interesting!

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