42042 straight triangle 4-5-6

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Hi all, I was building 42042 and I noticed these straight triangles:

Two sides at 90 degrees: 4 and 5 studs. 

And an angled beam of 6 studs connecting.

It matches up perfectly, the elements are not under stress.

However, I don't understand how this can exist. Pythagoras theorem a^2+b^2 = c^2 doesn't work out: 16 + 25 != 36.

Is there anyone who understands the maths better than me who can enlighten me why this works in the LEGO system?

I tried the 3-4-5 triangle but it doesn't match up! Do I have to subtract 1 of each beam length for some reason?

Schermafbeelding 2020-09-16 om 21.24.46.png

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The length is actually from mid-first hole to mid-last hole, so always add 1 to your Pythagorean triangles to get Lego equivalents.

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