Hi,(adsbygoogle = window.adsbygoogle || []).push({});

Please refer to the Pythagorean proof of the theorem that the angels in a triangle add to 180 degrees. The following link has the proof.

http://www.cut-the-knot.org/triangle/pythpar/AnglesInTriangle.shtml

You will note that this proof is based on the assumptions that angles on a straight line add to 180 degrees. But we have no proof of that fact. I mean we can measure it with a protractor, but is there a way to prove that?

So I am wondering about the whole process of proving a theorem. We use some assumptions to prove a statement. The assumptions themselves are theorems that have to proved somewhere else. Is that the right way to think about it?

Thanks.

**Physics Forums - The Fusion of Science and Community**

# Geometry - question about the proceess of proving a theorem

Have something to add?

- Similar discussions for: Geometry - question about the proceess of proving a theorem

Loading...

**Physics Forums - The Fusion of Science and Community**