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The distance around a geometric figure.
first thing you do
first, always make sure the units are the same [ex.) all cm or all km, not 2 cm and, like 5 mm]
how it relates to linear distance
you don't end your perimeter in a cubed or squared symbol, just use the linear distance
how to make an equation
take the total (say it's 24) and make it equal the measurements, but make the side you don't know equal a variable (so in this equation it would be 24=8+8+b)
how to solve the equation
solve the equation as normal- add all the like terms, and solve (24=16+b