Is this equivalent to the Pythagorean Theorem?

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The discussion centers on the interpretation of the Pythagorean Theorem as presented on a specific webpage. The statement "AB^2 = AC^2 + CB^2" is scrutinized, with the user expressing confusion over the derivation of this equation from the assertion "AB = AD + DB." The user attempts algebraic manipulation but fails to derive the Pythagorean Theorem, indicating a need for clarification on the definitions of the terms involved. The conversation highlights the importance of understanding geometric representations and the relationships between points in Euclidean space.

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So I was reading up on the Pythagoreans, and I came across this page: http://www.math.ufl.edu/~rcrew/texts/pythagoras.html .

I don't see the reasoning behind this statement.

"Since AB=AD+DB, adding these equations yields

A(B2)=A(C2)+C(B2)
which is the Pythagorean theorem."


I tried some simple algebra on this statement and couldn't get Pythag to fall out of it. Can someone figure out a derivation for this?
 
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That's not what the page says. It says,

AB^2 = AC^2 + CB^2

A, B, and C are not variables. AB represents the length between points A and B. You should read AB^2 as a single length being squared.
 

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