# Geometry

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Picture given with problem: media.glynlyon(dot)com/g_geo_2012/12/img_geou12abc_8.gif
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 -

You need to review properties of secants and circles. In your diagram,

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