There are several methods to find area and perimeter, depending on the shape of the figure. To find the area of a square or rectangle, use this formula: length x width. To find the perimeter, use this formula: (length x 2) + (width x 2).
- Find the length and the width
Measure the length and the width of the square or rectangle. You only need to measure one side for a square, since all of the sides are equal in length.
- Calculate the area
To calculate the area, multiply the length by the width.
- Add up to find perimeter
To find the perimeter, find the total measurement of the shape's outline. Find the sum of the lengths of all four sides of the square or rectangle. Alternatively, you can use this formula as a shortcut: (length x 2) + (width x 2).