You find the three sides of the triangle, and assure that they are all in the same unit, and then add the sides together to find the perimeter of the triangle.
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They don't always- they don't always 'has' a smaller perimeter than other triangles. A triangle can be absolutely any size as long as it has three sides and angles that add to 180 degrees
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two isosceles triangles with common line
The perimeter of any triangle is the sum of its 3 sides
An infinite number are possible.