Posted by **Jacob** on Saturday, January 9, 2010 at 11:31pm.

triangle with side lengths 172m, 155m, and 155m. calculate the area.

- Trig -
**Marth**, Sunday, January 10, 2010 at 10:44am
Use Heron's formula. Given sides a, b, c of a triangle, let s = (a+b+c)/2. Then A = sqrt(s(s-a)(s-b)(s-c))

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