Thales' Theorem

The powerful procedures possible with modern mathematics are rooted in logic that began thousands of years ago. Thales' Theorem demonstrates one style of early mathematical logic, a logic that is relevant and important today.

[learnerlearns]

Brilliant!
That was the best proof I've seen for Thales' Theorem. 
Good clear presentation!

[zoktoberfest]

When I was exposed to mathematics in my formative years, many decades ago, I had difficulty, even though, I otherwise had a technical mind. A condition, unbeknownst or misunderstood by the learning community, caused my mind to reject mainline, more direct paths of learning in favor of indirect, often more circuitous paths, otherwise known as dyslexia. In Jr High School the math department used a method that split the teaching session into two parts: 20 minutes of instruction and 20 minutes of student demonstration at the blackboard. For me that was absolute traumatic humiliation. I aced my exams and was placed into advanced class curriculum, but when forced to perform in front of an audience, using my alternative dyslexic logic, my mind froze solid and the students were as unkind as you might imagine. The teachers suspected that I was somehow cheating on my exams, before thinking I might have had a severe performance anxiety. Math became a nightmare for me and any hope of an engineer career was dashed completely. The same dynamic played out when I tried to learn music which impossible because dyslexics scans texts and scores erratically. This tutorial bypassed my dyslexic difficulties. Thank you

[haptik]

I love you. Please keep doing this. My 6 year old child loves them too. I failed math growing up, yet I'm a respected programmer. Funny how that works, Your videos helps me understand fundamentals. Thank you.

[biancaromay]

Can you believe a person from 600 BC figured this out. Thinking about that Blows. My. Mind.

[jgcooper]

even after you've gone, you're still around to teach us something new, just when I was looking for this, how comforting it was to find a video from you that explains it best than others.

[AllAmericanBeaner]

A channel I strongly recommend for fascinating mathematics is Numberphile!

[goldeneagle]

Simple, to the point n clear explanation. As is Thales was a wizard who made life simple for mankind.

[GlorifiedTruth]

So simple! But I wouldn't have seen it in 1, 000, 000 years.

[TheBdd]

Thanks, took me back to the time I first learned Geometry and came to love it.

[PLP]

Amazing! I had to prove this theorem for a math class and I was unsure on where to begin. Only wish I would have found this earlier. Great video!

[vinayseth]

Love your videos! You make the ideas come alive in a beautiful way. Thank you.

[enriquegonzalez]

In my humble mind I'm trying to understands how the Egyptian managed to build the pyramids and how much they did know about geometry.
Thank you, I know a bit more about the "Intercept Theorem"

[Thenraaj]

Thank you so much Sir, for this precious Video.... 🙏 🙏

[rauljaime]

Thank you this was very helpful and easy to follow keep up the good work. Thank you!

[vaibhavpatil]

i knew this this in school but never knew it is thale, thank u

[leopoldmedley]

Gosh dang where there ya have it folks!!

[moulinaie]

Is it ok to say this: lets add another point F as [DF] is another diameter.
Then [AB] and [DF] meet in their middle : so ADBF is a parallelogram.
And as AB=DF, it's a rectangle. So the angles are 90°.

[tehcno]

Thank you, Sir, for posting these precious videos.

[JoseLopez-opsq]

Suck a great video that gets to the point. Thank you!

[BleckBoy]

If you want a genuine proof that can be written in a "Statement-reason" format then just use the central angle and inscribed angle theorem.

<ACD=180[Angle of a straight line]
<ADB=0.5*ACB[Relation between central and inscribed angle]