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-- 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.

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The perimeter is the sum of all three sides. Sometimes it is unnecessary to compute each side length; all we care about is the sum.

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Q: How do you calculate perimeter of a triangle?
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