You simply can't convert between meters and square meters. Think of a (linear) meter as being infinitely thin.
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1 square meter is 1,000,000 square milimeters. As 1 mm is 1/1000th of a meter, 1000 x 1000 = 1,000,000
Easy. 1 m has 1000 mm. So 1 square meter would equivalent to 1000 mm x 1000 mm or 1000000 square millimeter.
72000 metres make 72 km
It would be a very small room. More like a closet. Try 1 meter by 3 meter, or 1.5 meter by 2 meter both would make 3 square meters.
The maximum area that you can contain with a 4-meter rope is a circle with a diameter of 4/π meters and an area of 4/π square meters, or about 1.273 square meters. If you use the rope to make an equilateral triangle with sides of 4/3 meter, you get an area of (4/9)(√3) or 0.770 square meters. If you use the rope to make a square with sides of 1 meter, you get an area of 1.000 square meter. If you make a polygon with more sides, the area bounded by your 4-meter rope will increase, approaching the limit of 4/π as the number of sides increases.