I think it's something like a + b + c.
side + side + side. Just adding them all together.
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Lengths of: equal side+equal side+base = perimeter
Perimeter of a triangle = (length of the first side) plus (length of the second side) plus (length of the third side)
I'm assuming that you mean the area of the triangle. You do not need the entire perimeter. The formula is 1/2 bh. b=base, h=hight
you add the sides together . a /\b a+b+c /_\ c
There is no reason for the perimeter of a triangle to have any relation to the perimeter of an unrelated rectangle!