Yes, the perimeter of any figure is the sum of all the sides.
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To find the perimeter of a figure, add up the lengths of all of its sides.
Just add each of the three lengths of the triangle together. In an equilateral triangle, all side are the same. In an isosceles, 2 sides are the same and one is different.
no
Add all 3 side lengths.
There is no circumference of a triangle. If the perimeter of a triangle is what you are wondering about, it is different for each triangle. Just add the three sides together.