-- 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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Semi-perimeter means half the perimeter. Calculate the perimeter, then divide that by 2 to get the semi-perimeter.
There is no reason for the perimeter of a triangle to have any relation to the perimeter of an unrelated rectangle!
The perimeter of a triangle 4.5 by 1.5 is: 10.74
You find the perimeter of a triangle by adding all the sides. There is no special rule for finding the perimeter.
The minimum perimeter is when the triangle is an equilateral triangle. The perimeter of any other triangle with the same area will be longer. In the case of an equilateral triangle area = (√3)/4 × side² → side = √(4×6.5 cm²/√3) → perimeter = 3 × side = 3 × √(4×6.5 cm²/√3) ≈ 11.62 cm → The triangle has a perimeter greater than or equal to approx 11.62 cm.