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To find square feet simply multiply length times width. Thus: 11' X 12' =132 square feet. If you needed to figure the amount of sheet rock to cover four walls in one room and the room is 11' X 12' with 8' ceiling height your equation would look like this: 11 x 12 x 4= 528 square feet Now divide the total square feet (528) by the amount of coverage one sheet of drywall offers. ie; one 4 x 8 sheet of drywall covers 32 square feet of space. 528/32=16.5 You would need 16.5 sheets to cover all the wall space with 4' x 8' sheets of drywall.

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Q: How many sq ft is 11 feet x 12 feet?
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