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2 of the walls are each 12' wide and 8' high.

Each of them needs 12 x 8 = 96 square ft to cover it.

2 of them need 2 x 96 = 192 square feet of sheet rock.

The other 2 walls are 16' wide and 8' high.

Each of them needs 16 x 8 = 128 square ft to cover it.

Those 2 walls need 2 x 128 = 256 square feet of sheet rock.

For the 4 walls all together, you need 192 + 256 = 448 square feet.

I'm not sure whether the sheetrock comes in the usual 4' x 8' sheets,

like the other kinds of paneling. If so, that's very nice, because the

height of the walls is 8', so the sheets exactly fit side-by-side and

standing up, without cutting anything.

If that's the case, then in order to go all the way around the 4 walls,

you need 16' + 12' + 16' + 12' = 56 feet . . . 14 sheets of rock, with

the 8-ft dimension of the sheets standing up.

The area is (14 sheets) times (8' x 4' per sheet) = 14 x 32 = 448 square feet,

and that jibes with the earlier calculation, 12 lines above this one.

Of course, you have to cut the rock for the doors and windows; otherwise

you'll have a problem getting in and out of the room.

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Q: How would you find out how many sheets of sheetrock to buy for a 12ft width 16 feet long and 8 foot high walls.?
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