The perimeter of the room - the total length around its edges - is 2*(10+15) = 50 units of length. It is not possible to give the answer in feet because the units for the measure of the room are not given.
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There is 121 square feet in a 11'x11' room.
That room would be 169 s.f.
A 30ft x 14ft room = 420 square feet.
Divide it by the width in feet. For example, if a red carpet has an area of 9000 square feet, and its width is 10 feet, so its length is 9000/10 900 linear feet. If you mean how do you convert square feet into linear square feet, just change the units. Let's take an example.If you have a 10' x 10' room, it is 10' x 10' 100 square feet. If you change the units from square feet into linear squarefeet, you'll have 100 linear square feet. That means if you are tiling the room with 1' x 1' tiles, you'd need 100 of them, and if you laid the tiles out end to end, you'd have 100 linear square feet.Aside from this thinking, you cannot convert area to linear measure without a "standard" or an "assumption" or "understanding" about it. Like with lumber, a board foot is a board 1" thick and 1' wide and 1' long, or 1 square foot in area. (Set aside thickness for this explanation.) A board 6" wide and 2' long is 1 board foot of lumber. Anyway, the assumption there is that the board is 1' in width. Again, we see some "standard" inserted to the quoted measurement so that what might appear to be a linear measure is actually something else. And that something else is a areameasure, with an understood width associated with it.
99 square feet !