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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
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Earn +20 ptsQ: How many square feet is a 21 ft x 30 ft building?
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Continue Learning about Math & Arithmetic
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.
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21 feet by 21 feet is a square having an area of 441 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).
How many square feet are in 61 inches x 21 inches?
61" x 21" = 8.89583 square feet.
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