where 
and 
and 
which you then use to find 
and 
Apply Heron's formula to 
to find that its area is 10, and then use ![[ABC]=\frac{(AB)(CF)}{2}](/tpl/images/0670/1510/dca59.png)
(base times height over 2) to finish by solving for 
.
I need the answer. Help me out
...
Answers: 3
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