add up all the sides?
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There is no reason for the perimeter of a triangle to have any relation to the perimeter of an unrelated rectangle!
If you know the perimeter, there is no need to find it again.
You find the perimeter of a triangle by adding all the sides. There is no special rule for finding the perimeter.
It,s easy. a+b+c= perimeter
Find the area of an equilateral triangle if its perimeter is 18 ft