What kind of triangle must have an altitude that is outside the triangle?
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So if you want to solve for c, the best thing to do is isolate the variable. So I personally don't enjoy dealing with fractions that much until the very end, so I am going to multiple the entire equation by 
to eliminate the fraction. So now the equation is 
. In order to isolate the c variable, subtract both sides by 
, which makes it 
. Now divide both sides by g, 
. So that's what c equals in terms of f, d and g.
