This question cannot be answered sensibly. A square foot is a measure of area, with dimensions [L2]. A linear foot is a measure of distance, with dimensions [L]. The two measure different things and basic dimensional analysis teaches that you cannot convert between measures with different dimensions such as these without additional information.
90 x 90 = 8100 square feet
150 x 90 = 13,500 square feet
100-ft x 90-ft = 9,000 square feet
3 x 30 = 90 square feet. 1 square foot = 144 square inches (12 x 12) So 90 square feet = 12,960 square inches
90 square meters is about 968.7519 square feet.
You can't calculate linear footage based on square yardage alone. If you meant square footage it will cover 810 sq. ft..
90 X 144 (INCHES PER SQ FT) = 12,960 INCHES. 12,960 INCHES DIVIDED BY 12 (INCHES PER LINEAR FT) = 1080 LINEAR FEET
90 x 90 = 8100 square feet
90 square feet. Multiply length by width - the result is the area in square feet.
90 x 130 = 11,700 square feet.
150 x 90 = 13,500 square feet
There are: 90*49.5 = 4455 square feet
You can't. A square foot is a measure of area. a regular, linear foot is a measure of length. The two units are completely incompatible.
To find how many square feet are in an area, multiply the length time the width. 20 x 90 is 180 square feet.
300 feet is a measurement of DISTANCE, while square feet is a measure of AREA. However, 300 averaged-sized human feet would cover about 100 square feet of area, although the owners of said feet would have to be VERY friendly. It is impossible to determine area from a single linear measurement. You need 300 feet BY some other linear measurement to calculate area.
3 x 30 = 90 square feet (90 ft2).
100-ft x 90-ft = 9,000 square feet