What is the formula to find the area of a rectangle?

The formula to find the area of a rectangle is A = lw, where A represents the area, l represents the length, and w represents the width of the rectangle. This formula works because the area is calculated by multiplying the length of the rectangle by its width, which gives the total number of square units that can fit within the rectangle. Each unit is formed by a square with side lengths of one unit, so by multiplying the length and the width, you can determine how many of these unit squares can fit in the rectangular space.

The other formulas provided relate to different shapes or concepts. For instance, A = bh represents the area of a triangle where b is the base and h is the height, while A = (base × height)/2 is also for a triangle. The formula A = (length + width)/2 describes the average of the length and width, but it does not calculate the area. Thus, A = lw is the only correct formula for determining the area of a rectangle.