# I am breaking my head over this probem for half an hour! Geometry probem - chord properties?

http://www.flickr.com/photos/53156739@N06/57239053...

(The graph - I couldn't describe it in words.)

Thank you!

### 1 Answer

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- ignoramusLv 79 years agoFavorite Answer
Draw AF and AD

In triangle AFE,

FE² = 10² - 8²

Hence, find FE

Triangle ADE is congruent, so find DE similarly.

CD = CF - (FE + ED)

In triangle AEC

AC² = 8² + EC²

EC = CF - FE, and you just found FE, so you can finish the problem.

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