The total distance around the outside of a shape. More generally, it can mean the outer edge or boundary of an area.
From Greek “perimetros,” from “peri-” (around) + “metron” (measure). It literally means “a measure around.”
Perimeter is just the “walk-around distance” of a shape—imagine tracing the edge with your feet. Knowing that “peri-” means “around” also helps with words like “periscope” and “peripheral.”
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