1. acute triangle formula needed

Hello,
An acute triangle, three perimeter side lengths are given and that is all that is given. No height, base or angles. Please give a formula to find the area of this type of triangle with only three perimeter numbers only, or explain how to find “b” from the perimeter. Area=1/2*b*h
thanks
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2. Heron's Formula -- from Wolfram MathWorldThis webpage is what you need.

3. will this work?

Hi and thank you for your help.
That sight is over me, but i think i found it.

s=9a+b+c)/2
also
area= square root of (s(s-a)(s-b)(s-c))

So then will this give me the area from the perimeter?

4. $s = \frac{{a + b + c}}{2}$ is the semiperimeter.
Then the $Area = \sqrt {s\left( {s - a} \right)\left( {s - b} \right)\left( {s - c} \right)}$
That is the actual area of the triangle with sides of length a, b, & c.

see you.
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