Assuming you mean perimeter (not pirimeter) and triangle (traingle) you need to sum together the lengths of the three sides.
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The circumference
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.