base times height minus half of the perimiter base times height minus half of the perimiter
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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.