# Math Help - Help Urgent

1. ## Help Urgent

Is there a formula of finding the area of a triangle given three sides? Aside from using the law of cosine?

Aside from
1/2 a c sinB
1/2 a b sinC
1/2 b c sinA

given sides a,b,c = ???
i only need a formula
help!

2. Originally Posted by ^_^Engineer_Adam^_^
Is there a formula of finding the area of a triangle given three sides? Aside from using the law of cosine?

Aside from
1/2 a c sinB
1/2 a b sinC
1/2 b c sinA

given sides a,b,c = ???
i only need a formula
help!
Its Heron's formula:

Put $s=\frac{1}{2}(a+b+c)$, then area:

$A=\sqrt {s(s-a)(s-b)(s-c)}$

RonL

3. Thanks agen captain!