The Perimeter is the total distance around a shape, starting and finishing at the same point.
Here the perimeter is 1 + 2 + 1 + 1 + 2 + 3 = 10 cm
Remember that the area of rectangle is its length x its width.
If you know the area and one side, you can divide to find the other side's length
A rectangular room has an area of 12 m2
If its length is 4 m, what is its width?
We divide 12 ÷ 4 = 3
So width = 3 m