Well, let's paint a happy little picture here. To find the square footage of a rectangle, you simply multiply the length by the width. So, for a rectangle that is 4 feet by 10 feet, you would multiply 4 by 10 to get 40 square feet. Isn't that just a lovely little calculation?
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For any rectangle (4 sides, 4 right angles) the area is L x W. In this case this is 17 x 10 = 170 square feet. Recall a square is a rectangle too.
10 x 4 = 40 square feet
4' * 4' = 16 sq feet.
4' X 6= 24 square feet.
56 square feet.