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The sides of a triangle add up to the perimeter.
18 inches and it is an equilateral triangle
Add the 3 sides together
It depends on what you wish to measure: the lengths of sides, the angles, the area, the perimeter.
-- Measure or calculate the length of one side. -- Measure or calculate the length of another side. -- Measure or calculate the length of the only remaining side. -- Add the three numbers. The sum is the perimeter of the triangle.