Correction for the size of The Pentagon
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How big is 213,096,000 dunams?
It's about 1,500,000 times as big as The Pentagon
The size of The Pentagon is about 138 dunams.
(a.k.a. United States Department of Defense Headquarters) (Washington, D.C.) (total floor area)
The Pentagon, the world's largest office building, contains a total floor area of 138 dunams. Built during World War II, the designers compensated for the steel rations then in effect by using 310,000 cu. m of concrete in the construction efforts.