If you need to find how big something 2-D is you need to know how to find the area of various shapes. If carpeting you need area. You don't think about it but area is very important. Math isn't useless and is very important int he real world.
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You would need to divide it into triangles, find the area of each triangle and sum these areas together.
The lengths of the base and the side. You would multiply these to get the area and would double sum of the two to obtain the perimeter measurement.
you need length and width length multiply width = area length + length + width + width = perimeter
You would need to know the surface area of a cylinder if you are a factory worker at Pepsi. You would need to know the dimensions of the label, so it will fit on the can.
You need the height as well to find the area, but the proper equation would be A= 5.5h