Parallel & Perpendicular Lines Proof

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Professor RobBob, thank you for another great video/lecture on Proving Parallel and Perpendicular Lines. I am following all the proofs on a step-by-step basis; however, I will review the material for a solid understanding of the concepts.

georgesadler
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Thank you so much for this video!!! You have helped my daughter tremendously in just a few minutes. We will definitely be checking out your other lessons. THANK YOU!!!!

eringabany
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Thank you for the time and effort you put into your videos! They are clear and helpful, and I appreciate your enthusiasm. You make geometry easier!

intellexual
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dint really understand this, but thanks for the effort 

nizanondo
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I am sorry to hear that. I hope that you do as well as possible tomorrow.

profrobbob
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The first proof is from Euclid's Elements,
Book 1, Proposition 30.

comicrelief
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Regarding 7 min. into your video, does the context of Theorem 3.7 have to be bounded by a plane or should there be some other way to prove lines parallel to each other in space?

chordsequencer
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You explain good but i still dont understand it and my finals are tommorrow

babosurji
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Hello! I am currently in Geometry and am having trouble with proofs. I am currently trying to fill out my review packet, and am working on a proof for theorem 3.11. Would there be any way you could help?

tessawarren
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In which playlist would this video be located? I've looked for it in Geometry and I can't find it.

mariselamayor