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Thales' Theorem

[b]Theorem: [/b]Given a circle[i] c[/i] with diameter [i]AB[/i] and point [i]C[/i] on the circle such that [i]C[math]\ne[/math]A,B[/i], [math]\bigtriangleup[/math][i]ABC[/i] will be a right triangle. [br][br][b]Proof: [/b]Try it out!