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It is: 6m
800
No
An area cannot be 30m since that is a linear measure, not the measure of an area. The lowest perimeter, for an area is attained by a circle. So for an area of 30 m2 this was attained by a circle of radius R, then πR2 = 30 so that R2 = 30/π and R = sqrt(30/π) The perimeter = 2*π*R = 2*π*sqrt(30/π) = 2*sqrt(30*π) = 19.42 metres