21 x 4 = 84 square feet.
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?
4' * 4' = 16 sq feet.
4 x 9 = 36 (square feet).
36 x 4 = 144 square feet.
21 x 4 = 84 square feet.
4*9 = 36 square feet.4*9 = 36 square feet.4*9 = 36 square feet.4*9 = 36 square feet.
If the given dimensions are in feet then 4 times 4 equals 16 square feet
4' X 6= 24 square feet.
43.0556 square feet.
Simply multiply 8 feet by 4 feet and you have your answer... 32 square feet!
56 square feet.