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September 21, 2014

September 21, 2014

Posted by **Greg** on Friday, April 29, 2011 at 11:27am.

Thanks so much!

- Math -
**Reiny**, Friday, April 29, 2011 at 2:19pmWhere does point E enter the picture?

It is supposed to be a point of tangency, is it the point where the two circles are "connected" ?

It does not appear to enter into the calculation of AB.

From C draw a line parallel to AB to cut BD at F.

So FC = AB since we now have a rectangle where

angle DFC = 90°

by Pythagoras,

FC^2 + 5^2 = 13^2

FC = 12

so AB = 12

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