I have never taken a Trig class and I'm in a pre-calc class, this is from the study guide. I have the answers I just don't know how to get there.

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s is the semi-perimeter of the triangle, that is, s = (a + b + c)/2

where a,b,c are the sides of the triangle

Sorry, I didn't correctly include the photo in the original post, I still don't quite understand.

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