- #1
rocomath
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Homework Statement
If a, b, c are the lengths of the sides of a triangle, then the area K of the triangle is given by [tex]K=\sqrt{s(s-a)(s-b)(s-c)}[/tex], where [tex]s=\frac{1}{2}(a+b+c)[/tex]. The number s is called the semiperimeter. Prove Heron's Formula. Hint: Use the area formula [tex]K=\frac{1}{2}bc\sin\phi[/tex].
sinphi should be sinA. it wouldn't let me use sinA.
The Attempt at a Solution
Absolute torture if you ask me! I need help getting on the right track, any help is appreciated.
Ignore everything from the triangle and down, that's a different problem.
http://img206.imageshack.us/img206/697/53149485pi4.jpg
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