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# How to calculate the number of wallpapers on the room

The first step is to determine the perimeter of the room. Remember math in elementary school? The formula for calculating the perimeter is simple: (width + length) x 2. This is if your opposite walls are the same, that is, the room is strictly rectangular. If the room is complicated, the walls are broken and of different lengths, then the formula of the perimeter will look different: A1 + A2 + A3 + A4. That is, each wall will have to be measured separately, and then everything is folded in order to get the perimeter. Similarly, the perimeter is calculated if there are niches or protrusions in the room. Continue reading

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