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This would depend upon how many floors the building has, and what shape/size each floor is :D
To answer your question honestly, though, the area of a rectangle is length * width. As your question already hints, the answer is to simply multiply the two numbers together!
21ft * 30ft = 630 square feet
What else can I help you with?
How many square feet are in 21 x 19 room?
21 feet times 19 feet = 399 square feet
How many square feet is 99 inches by 21 inches?
14.4375 square feet.
How many square feet are in 21 yards?
Square feet measure area, and yards measure length. If you mean FEET in 21 yards, the answer is 63 (3 times 21). If you mean square feet in 21 SQUARE YARDS, the answer is 189 (three times three times 21).
What is 21 by 21 feet?
21 feet by 21 feet is a square having an area of 441 square feet.
How many square feet are in 61 inches x 21 inches?
61" x 21" = 8.89583 square feet.
How many square feet in a 21' x 21' room?
21*21 = 441 square feet.21*21 = 441 square feet.21*21 = 441 square feet.21*21 = 441 square feet.
How many square yards is 21 feet by 21 feet?
21 feet by 21 feet is 441 square feet which converts to 49 square yards.
How many square feet in 3 X 7?
21 square feet.
How many square feet are there in 21 feet by 4 feet?
21 x 4 = 84 square feet.
How many square feet is a floor 21 by 3 feet?
21*3 = 63 square feet.
How many square feet is 21 feet by 12feet?
Just multiply the 21 by the 12 and you have 252 square feet.
How many square feet are in a 21 foot x 21 foot room?
21 x 21 = 441 square feet
How many square feet are in an surface area of 14 feet by 21 feet?
14 x 21 = 294 square feet.
How many square feet are in 21 x 19 room?
21 feet times 19 feet = 399 square feet
How many square feet in 21 times 12?
21 x 12 = 252 square feet.
How many Sq. feet are in 21 Sq. yards?
21 square yards = 189 square feet.
How many square feet is 21 square yards?
189 square feet. (multiply square yards by 3 to get square feet)
