D!NG | Thales's Theorem @dingsauce | Uploaded 5 years ago | Updated 17 hours ago
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Thales's Theorem on wikipedia: en.wikipedia.org/wiki/Thales%27s_theorem

Thales's Theorem is a special case of the inscribed angle theorem: en.wikipedia.org/wiki/Inscribed_angle

"axiom" vs "postulate" vs "theorem": math.stackexchange.com/questions/7717/difference-between-axioms-theorems-postulates-corollaries-and-hypotheses

The axioms of Euclidean plane geometry: http://www.math.brown.edu/~banchoff/Beyond3d/chapter9/section01.html

sum of internal angles in a triangle:

cut-the-knot.org/triangle/pythpar/AnglesInTriangle.shtml
en.wikibooks.org/wiki/Trigonometry/Proof:_Angles_sum_to_180
en.wikipedia.org/wiki/Sum_of_angles_of_a_triangle
complete-concrete-concise.com/mathematics/proving-that-the-angles-in-a-triangle-sum-up-to-180

parallel theorems: mathbitsnotebook.com/Geometry/ParallelPerp/PPverify.html

more circle theorems: mathsisfun.com/geometry/circle-theorems.html

angles opposite equal sides in a triangle are equal: gradestack.com/CBSE-Class-9th-Complete/Triangles/Angles-Opposite-to-Equal/14901-2953-3986-study-wtw

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