Best Answer

If you have the other two triangle's sides you can use a2+b2=c2

Plug in the long one for c!

Say i had the side lengths of 2 and 5. 5 is the longest side. 2*2+b2=5*5


-4 -4

b2=21 do the square root of both


Then check it: 2*2+4.58*4.58=5*5

4+21=25 25=25 that would be correct

I took Algebra in 7th grade and I think it was a lot of fun!

But to answer your main question the formula a2+b2=c2

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Q: What is the formula to find the side of a triangle?
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