
Minimum Perimeter
I am having trouble finding the minimum perimeter of a rectangle with 3 enclosed sides. I am given the area of the rectangle which is 180m^2. I have no clue how to solve this but here is my attempt
Isolate w, b/c the length of the rectangle would be twice the width when enclosing 3 sides
A=lw
180=lw
180=lw
l l
w=180
l
sub into the formula for area of a rectangle
P=2(l+w)
P=2(l+180)
l
i dont know how to solve such an equation my knowledge of order of operations

Please post the exact original problem IN FULL.

Monroe wants to build a 180ft^2 deck against his house. He has to enclose all sides of the deck except the one against his house. What is the minimum length of railing needed?