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m
length ≥ 10 m and length ≤ 20 m
By unit of length and distance and conversion ,we can say that 1 cm=0.01 m =10 mm
It is m^2 square units.
A rectangle has 4 sides and the opposite sides are of equal length. You therefore have two sides of length 5 m and two sides of length 11 m. To get the perimeter you add up the length of all the sides. I will leave this last bit for you to do.