×

# P = 2L + 2W and A = L x W?

## All commonly used formulas for geometric objects are really mathematical models of the characteristics of physical objects. For example, a basketball, because it is a sphere, can be partially modeled by its distance from one side through the center (radius, r) and then to the other side by the diameter formula for a sphere: D = 2r. For familiar two-dimensional variables length, L, and width, W, the perimeter and area formulas for a rectangle are mathematical models for distance around the rectangle (perimeter, P) and the region enclosed by the sides (area, A), respectively:

Jul 1, 2018

$\text{Let P = Perimeter, L = Length, W = width, A = Area, of a retangle}$
Then $P = 2 L + 2 W$
$A = L \cdot W$