Lesson 9 - High Tech High
9-11 Measure of Tangent-Chord Angle. The measure of an angle formed by a chord and a tangent that intersect on the circle equals half the measure of the intercepted arc. In other words: m and . m . Proof: Draw the radii of the circle to points A and B. Triangle AOB is isosceles, therefore . We also know that, because FE is tangent to the circle. ................
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