To calculate the square footage of a rectangle, you simply multiply the length by the width. In this case, 19 feet by 20 feet would be 380 square feet. This is because 19 feet multiplied by 20 feet equals 380 square feet.
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380 sq. feet
It is: 20 times 20 = 400 square feet
20 X 30 = 600 square feet.
800 square feet (40 x 20 = 800).
If the numbers are in feet then 86 times 20 = 1720 square feet