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January 31, 2015

January 31, 2015

Posted by **Will** on Monday, January 14, 2013 at 6:58am.

If AC = 20, AE = 25, and AB = 5, what is the length of AD?

Please explain how this is found, I've got a few problems like this and have no idea how to do it.

- Geometry -
**Steve**, Monday, January 14, 2013 at 8:36amYou need to review properties of secants and circles. In your diagram,

AB*AC = AD*AE

5*20 = AD*25

AD = 4

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