Huh? If the side of the square is 1 foot, it can't also be 90 feet.
Anyway, to calculate the area of a square, you multiply side x side.
1 square-foot.
A square with sides that are one foot long. It has a perimeter of 4 feet and an area of 1 square foot.
The area of a square or rectangle is the product of its length and width. The area of a square having sides 2 foot in length is 4 square feet.
A square with 14 foot sides is 196 sq. feet.
rectangle
No. One yard is three feet. One square yard is three feet on each of 4 sides. One square foot is a foot on each of four sides. One square yards has 3 times the area of one square foot.
It's the area covered by a square whose sides are each 1 foot long.
Multiply the edge length by itself. For example, a square with 4 foot sides has 4x4=16 square feet of area.
A sq foot is the amount of area of a square that's sides are each 1 foot.
This square prism is a cube with six sides, each having an area of one square foot. Thus, the total surface area is six square feet.
A measure of area in the old system of measurement. It is the area equivalent to the area of a shape that is square and one foot (30 cm) on all sides
1 inch by 9 inches = 9 square inches = 0.0625 square feet = 1/16 square foot