Do you mean the perimeter? That is 2 x (width + length).
The surface area can't be expressed in linear feet.
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A 15-foot wide circle has an interior area of 176.71 square feet and a distance around the outside (circumference) of 47.1 feet.
15 x 15 is a square unit whereas foot is a linear unit. A linear unit can be said to have either zero or infinite width which means that either no matter how many feet you have you will never cover any area 15 x 15 or 15 x 15 is as near to zero feet as makes no odds.
I'm assuming that forty-five feet is linear feet, not square feet. There are 3 feet per one yard. 45 ft divided by 3 is 15 yards.
If this is for flooring linear feet may be established with just the length of 15' x 4". If flooring is being sold by the linear foot the width will already be established by the flooring you choose. Most come on a roll that is 10-12 feet wide. If it is the parameter measurement that is needed, just add the four sides. It is not a bad idea to just round inches up to feet and add.(16+16+9+9= 50') Feet can be converted to inches by multiplying by 12 and then adding the four sides. Feet would then be found by divided that answer by 12. The answer will be about 48 feet.