The formula is for the area of a triangle is area =base x height/2.
However, if you really do want the Volume of a triangle, I'm afraid there is no answer in plane geometry.
In spherical geometry the answer would be (1/3)*E*R^3 where R=radius of the sphere and E is the sum of the interior angles of the triangle minus pi (all in radians).
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Assuming you mean perimeter (not pirimeter) and triangle (traingle) you need to sum together the lengths of the three sides.
Yes, but it would have to be a triangle, not traingle!
make it a quadrangle & divide by 2.
Assuming that a traingle is meant to be a triangle, then the answer is none.
3... If its a traingle it has 3 angles where the sides meet.