Circle theorems | Lesson (article) | Khan Academy
https://www.khanacademy.org/test-prep/v2-sat-math/x0fcc98a58ba3bea7:geometry-and-trigonometry-easier/x0fcc98a58ba3bea7:circle-theorems-easier/a/v2-sat-lesson-circle-theorems
webA circle has center O, radius OB, and diameter AC. The radii OB, OC, and the chord BC form a triangle, and angle OCB in the triangle measures 25 degrees. Central angle AOB measures x degrees. In the figure above, O is the center of the circle, and A C ― is a diameter of the circle.
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