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Geometry 7 Online
OpenStudy (anonymous):

HELP PLEASE!!!! http://media.education2020.com/evresources/2092499_40a8915b-80e3-46dc-a149-5261526d5c6b.png secant DB intersects DZ at point D Find the length of DA A. 0 B. 1 C. 3 D. 9

OpenStudy (perl):

If two secant segments are drawn from a point outisde a circle, the product of the lengths(C+D) of one secant segment and its exteranal segment(D) equals the product of the lengths (A+B) of the other secant segment and its external segment (B). http://www.mathwarehouse.com/geometry/circle/tangent-secant-side-length.php

OpenStudy (anonymous):

thank you!

OpenStudy (perl):

plug your values into that formula and solve for x.

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