Why won't Pythagorean theorem work for me?

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How do i check if the follow is a right angled triangle?

I have:

A = 5
B = 1
C = ?

How do i know if this IS or ISNT a right angle?

please help!

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Kryštof Vosyka On

You cannot. Triangle cannot be fully defined by only lengths of two sides.

However, you can say that if you had a triangle with sides a and b, in order for it to be a right angled triangle, it has to hold true that c^2 = a^2 + b^2