Area formulas for squares and rectangles are formed by simply multiplying any pair of consecutive sides together. Refer to Figures 5.1(a) and 5.1(b).
Example 1: Find the perimeter and area of Figure 2.
Figure 2 Finding the perimeter and area of a square.
This is a square.
Example 2: Find the perimeter and area of Figure 3.
Figure 3 Finding the perimeter and area of a rectangle.
This is a rectangle.
Example 3: If the perimeter of a square is 36 ft, find its area.
The area of the square would be 81 square feet.
Example 4: If a rectangle with length 9 in has an area of 36 in 2, find its perimeter.
The perimeter of the rectangle would be 26 inches.