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because bob named it that... Ok?

If you mean the building, it is because it is pentagonal in shape. If you mean the shape, "pentagon" is greek for "five angles".

Actually, I think the Pentagon is named so because of the five branches of the military: U.S. Army, Marine Corps, Navy, Air Force, Coast Guard. And then it was built to be five sided to represent those branches.

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13y ago

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