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Identify and describe relationships among inscribed angles, radii, and chords. Include the relationship between central, inscribed, and circumscribed angles; inscribed angles on a diameter are right angles; the radius of a circle is perpendicular to the tangent where the radius intersects the circle.


Tangent Lines and the Radius of a Circle
Right triangles inscribed in circles I
Right triangles inscribed in circles II
Neglecting the Curvature of the Earth