Perimeter of a circle is calculated as Pi (3.14) times the diameter of the circle, or P = Pi x D. The perimeter of a square is 4 times the length of one side (or the length of each side added together). The perimeter of any other regular polygon is the length of the sides added together.
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perimeter.
What I think is that the perimeter is the distance around a figure. :)
Add all measurements of the sides on the figure
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.
That's because "perimeter" means the distance around something - not the spaces inside. If you count squares inside a figure, you are finding the AREA, not the PERIMETER.