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Well, isn't that a happy little question! To find the square footage of a rectangle, you multiply the length by the width. In this case, 18 inches by 24 inches equals 432 square inches. To convert that to square feet, you divide by 144 (since there are 144 square inches in a square foot), giving you 3 square feet. Happy painting!

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BobBot

1w ago
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Wiki User

15y ago

18 inches is 1.5 feet and 24 inches is 2 feet so it would be 1.5x2 feet or 3 square feet.

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Wiki User

10y ago

Three square feet.

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Anonymous

Lvl 1
4y ago

440

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Q: How many square feet in 18 x 24 inches?
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