-- 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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Find the perimeter of a right triangle with legs measuring 3 and 4
The perimeter is the sum of all four sides, so you need to calculate 2 x length + 2 x height. The fact that the rectangle is at the bottom of a triangle is irrelevant - except that in specific diagrams, information may be provided that lets you calculate the length or the width of the triangle.
By adding together the 3 line segments.
-- Measure or calculate the length of each of its 3 sides. -- Add the lengths of its 3 sides. -- The sum is the perimeter of the triangle.
Find out what 1 side is and multiply by 3 to find perimeter