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Mathematics 21 Online
OpenStudy (anonymous):

In the diagram, segment CD is tangent to the circle, AB = 6 in, and BD = 10 in. Find AD.

OpenStudy (anonymous):

I keep getting 16.73

OpenStudy (trojanpoem):

|dw:1450214490603:dw| Cos theta = 6/10 = 3/5 (first triangle) Costheta = [ (10)^2 + (6)^2 - x^2 ]/2 * 10 * 6 = 136 - x^2/120 (2nd triangle) costheta = 3/5 = (-136-x^2)/120 136 - x^2 = 72 x^2 = 64 x = 8 in #

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