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
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1 : 9 1 yd = 3 ft → 1 ft : 1 yd = 1 ft : 3 ft = 1:3 → 1 sq ft : 1 sq yd = 1 ft × 1 ft : 1 yd × 1 yd = 1 ft × 1 ft : 3 ft × 3 ft = 1 sq ft : 9 sq ft = 1 : 9 As you can seem, the scale factor of an area is the square of the scale factor of a length.
144 sq.in.
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If the area of a square is one square foot, it means that each side of the square is one foot long. The perimeter of a square is the sum of all its four sides, so in this case, the perimeter would be 4 feet (1 foot + 1 foot + 1 foot + 1 foot).
1 square meter (m2) = 10.76391 square feet.