In a number of careers, you need to know "how far around" a room or other object is; this is a common way of saying that you need to know its perimeter. To put it another way, the perimeter is the length around an object or a shape. The word “perimeter” comes from Greek, where peri means "around" and meter means "measure."
The perimeter of Canada is the distance along her boundary over land and sea. A trip around Canada is estimated to be 12,000 miles.
If you're landscaping, think bender board. If you're pouring concrete, think forms. If you're designing clothing, think rick rack. Even physical therapists and fitness trainers measure around waistlines, biceps, and thighs. Those are perimeters, too.
Perimeter is related to length, so units of measure for perimeter are also related to units of measure for length. Perimeter like length can be measured in both metric units (km, m) and inch-based units (ft, mi). Check out the table here to see both systems side by side, symbols and under what other names perimeter might show up in Trades tasks.