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I'm going to assume that you mean the room is 8-ft high.

Floor . . . 480 square feet

Ceiling . . . 480 square feet

Two walls . . . 160 square feet each

Other two walls . . . 192 square feet each

Total square feet of surface area inside the room = (480 + 480 + 320 + 384) = 1,664 square feet

If you're using this number for paint, remember to take off the area of

doors, windows, baseboard heaters, electrical outlets, etc.

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