Area 51 contains hypotheses that are Top Secret/Sensitive Compartmented Information.
At the other extreme, a figure with given perimeter L could have an arbitrarily small area, as illustrated by a rhombus that is "tipped over" arbitrarily far so that two of its angles are arbitrarily close to 0 and the other two are arbitrarily close to 180
01 square kilometresOther uncommon metric units of area include the tetrad, the hectad, and the myriad

