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The Pentagon is located in Arlington County, Va., in the United States. It is located near the national capital, Washington, D.C. The Pentagon is a large five-sided building and is home to the U.S. Department of Defense headquarters.

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The Pentagon contains 6.5 million square feet situated on approximately 34 acres, including its 5-acre central courtyard. It has five stories above ground and two basement levels under ground. Its corridors run 17.5 miles. The Pentagon is the largest office building in the world.

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There are examples of pentagons in real life in man-made structures like the Pentagon in the United States, and also in nature in flowers like morning glories and okra. Other items, like home plates in baseball, are often in the shape of irregular pentagons.

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As of 2014, about 23,000 people work in the Pentagon. The staff at the Pentagon includes a combination of civilian and military personnel. The facility was completed in 1943 and was meant to be the hub from which the country managed issues related to World War II.

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To calculate the area of a regular pentagon, the perimeter of the polygon is multiplied by the apothem and the result is divided in half. The mathematical formula for the calculation is area = (apothem x perimeter)/2.

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A pentagon is a two-dimensional geometric figure that has five sides. A regular pentagon is one where all five sides are the exact same length and the internal angles are all 108 degrees.

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The Pentagon Papers is the informal name for the Report of the Office of the Secretary of Defense Vietnam Task Force published in 1967. The report was never intended to be seen by the general public, but it was leaked to the New York Times by military analyst Daniel Ellsberg.

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Usually when a person refers to a "three-dimensional pentagon," he is referring to a regular dodecahedron. A dodecahedron is a solid made of 12 flat faces, and a regular dodecahedron is made of 12 regular pentagons.

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The interior of a pentagon has five angles totaling 540 degrees. In a regular pentagon – a polygon with five congruent sides and five congruent angles – each angle is 108 degrees. Each exterior angle of a regular pentagon is 72 degrees.

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There are two floors beneath the bottom floor of the Pentagon. The two underground floors are labeled "M" for "Mezzanine" and "B" for "Basement."