For calculating area in rectangular areas, what formula is used?

The formula used to calculate the area of rectangular areas is determined by multiplying the length by the width. This is because the area represents the amount of two-dimensional space that the rectangle occupies. When you multiply the length by the width, you essentially count how many unit squares fit inside the rectangle, as each unit square has an area of one square unit.

For a rectangle, if you have a length that is 5 units and a width that is 3 units, the area calculation would look like this:

Area = Length x Width = 5 units x 3 units = 15 square units.

This method of calculation applies universally to any rectangle, regardless of its dimensions. In contrast, the other options do not yield a proper calculation for area — they involve addition, subtraction, or division, which do not accurately represent how area is calculated in geometric terms.