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14-3secantangleslesson-130711101710-phpapp01 (2).pdf

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  LESSON 14-3: A CAN’T, B CAN’T, SECANT!!!  SECANTS, TANGENTS AND ANGLES ã Up until now, we have discussed the tangents and inscribed angles of certain circles. ã Now, we can discuss secants and the angles created by them.  SECANTS, TANGENTS AND ANGLES ã Like a tangent line , we judge a secant line by the number of times it intersects the circle. ã THE NUMBER IS TWO!!! ã When two secant lines intersect inside a circle then the angle formed is related to the arcs they intercepts.  SECANTS, TANGENTS AND ANGLES ã Theorem 14-8: If two secants or chords intersect in the interior of a circle, then the measure of an angle formed is one half the sum of the measure of the arcs intercepted by the angle and it’s vertical angle .
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