Correction for the size of The Pentagon
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How big is 0.71640 square inches?
It's about 0.000000004 times as big as The Pentagon
The size of The Pentagon is about 214,000,000 square inches.
(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 214,000,000 square inches. 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.