# Help Urgent

• August 8th 2006, 03:57 AM
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!
• August 8th 2006, 04:08 AM
CaptainBlack
Quote:

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
• August 8th 2006, 04:25 AM