Given that CD = 15 and is a secant to the circle, and BD = 12, which is the length of AB?

Question

anonymous · Answer

http://contentlaunch.ple.platoweb.com/testimagedb/26/261f6eecab78f81d834d531b5a6bdbe4

anonymous · Answer

I can't open the address for some reason.

mertsj · Answer

Anyway it is a test and you should not be cheating on a test.

anonymous · Answer

|dw:1374541146362:dw|

anonymous · Answer

NOT A TEST./

mertsj · Answer

Then why does it say "test image"?

anonymous · Answer

Idk but when I signed onto this it didn't say Test so im pretty sure its not a test.

mertsj · Answer

If a secant segment and tangent segment are drawn to a circle from the same external point, the product of the length of the secant segment and its external part equals the square of the length of the tangent segment.

anonymous · Answer

I don't know how that could help me.

mertsj · Answer

Perhaps you don't know what tangents and secants are.

anonymous · Answer

well if I did im sure I could figure it out

mertsj · Answer

Or you could google it and find a picture that might help you.

anonymous · Answer

that wont help... I need an equation not a pic

mertsj · Answer

Sometimes pictures have equations accompanying them.