The perimeter of something is just the length around it, so any unit of length could be used. For example, millimetres, centimetres, metres, kilometres, inches, feet, yards, rods, chains, furlongs, miles...!
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The perimeter is 31.11 units.
Area: 4*4 = 16 square uints Perimeter: 4+4+4+4 = 16 units
8
It is: 7.5+7.1+8.2 = 22.8 units.
Linear units are used for perimeter because perimeter measures the total length around a shape, which is a one-dimensional measurement. In contrast, area measures the extent of a surface in two dimensions, requiring the multiplication of two linear measurements (length and width), resulting in square units. This distinction helps accurately represent the different dimensions involved in each measurement.