If the dimensions of the rectangle are in feet, the perimeter will be in feet as well. The area will be in square feet. The area is length x width. The perimeter is 2 x (length + width) or 2 x length + 2 x width.
Multiply the length [in feet] times the width [in feet] and then the answer would be the total square footage.
To find the area in square feet of a rectangle measuring 60 feet by 80 feet, you multiply the length by the width: 60 x 80 = 4,800 square feet. Therefore, the area of the rectangle is 4,800 square feet.
Area of rectangle = length x width = 25 x 12.5 = 312.5 square feet
To find the area in square feet for a 3'x6' rectangle, multiply the length by the width: 3 feet x 6 feet = 18 square feet. Therefore, a 3'x6' area is 18 square feet.
2_x_ + 2(x – 4) = 45