Circumcircles
Free Math animations on the web.
Circumcircle is a circle that passes through every vertex of a triangle.
https://www.mathopenref.com/trianglecircumcircle.html
Play with the vertexes to change the size of the triangle and change the circumcircle.
Right triangles are a special case:
In the case of a right triangle, the hypotenuse is a diameter of the circumcircle, and its center is exactly at the midpoint of the hypotenuse. This is the same situation as Thales Theorem, where the diameter subtends a right angle to any point on a circle's circumference. (www.mathopenref.com).
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