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Geometry 9 Online
OpenStudy (anonymous):

The radius of circle O is 18, and OC = 13. Find AB. Round to the nearest tenth, if necessary. (The figure is not drawn to scale.)

OpenStudy (anonymous):

OpenStudy (anonymous):

I think it is C but not completely sure.

OpenStudy (anonymous):

By Pythagoras' theorem \[OB^{2} = CB^{2} + OC^{2}\] So AB = 2CB and you know the answer

OpenStudy (anonymous):

thank u! i get confused with the order of formulas ...

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