Yes, LxW=Area. For Surface Area, add up the area of all the sides
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In the formula for the rectangle, put the width equal to the length.
Square is a special case of a rectangle and the same formula may be used to find the perimeter
-- Slice it down one side and flatten it out. -- Now you have a rectangle. You only have to find the area of a rectangle. -- The area of a rectangle is (length) times (width). -- The length of the rectangle used to be the length of the cylinder. -- The width of the rectangle used to be the circumference of the cylinder's round ends, while it was still rolled up.
For a room that is a rectangle, multiply length times width.
The rectangle can be thought of as two adjacent 12 x 12 squares. Each square has an area of 144 sq. ft., making the entire rectangle 288 sq. ft. thereby creating a needless extra step, since the area of the rectangle is 12 x 24 = 288 sq. ft.