The area of anything is determined by multiplying length x width.
When you want to find the perimeter of a rectangle you must use the formula 2l+2w. this means 2 time length + 2 times width. so do as the following
*the 2 stands for how many times you multiply your numbers by
P=2l+2w
P=2(# of length)+2(3 of width)
P= # of length times 2+ # of width times 2
P= length width
And this is how you find the perimeter of a rectangle
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You've already given the answer in your question because a square, a rectangle and a rhombus are all classed as 4 sided quadrilaterals.
length x width = area
You can convert the built up area into the carpet area by simply covering the area in a carpet.
Area 4
the equation for area is area = length * width. area = 3cm*4cm. Area = 12cm^2