How to get an area of 3unequall sides triangle

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triangle area = 1/2 * base * height   _________1
triangle area = 1/2 * length of first rib * length of the second rib * sin x  _________2 
x = the angle between the ribs
3 _ 
( triangle area = sqrt y*   (y - a * y - b * y - c 
a = length of first rib
b = length of second rib
c = length of third rib
y = a+b+c
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