diameter
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the perimeter is the sum of all the sides in a figure, and centimeter is a length. so the question is what is the sum of all the sides of a figure in centimeters
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Divide the irregular figure into manageable pieces and work out their individual areas, sum the areas to that of the original figure. Measure the perimeter.
The perimeter is the sum of all of the sides of the figure. So, simply add up ALL the sides to discover what the perimeter is.
Perimeter of what? A circle diameter times Pi. Another shape the sum of all sides.