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Pentagon related content:

Pentagon stories:

IG: Pentagon should track assault of contractors
Feb 12th, 2010 - Washington Post
washington -- the sexual assault of employees of u.s. military contractors working in iraq and afghanistan will be tracked by the pentagon under a system it is setting up. the tracking will likely begin this year, defense official gail mcginn
Pentagon to offer emergency contraception abroad
Feb 4th, 2010 - Houston Chronicle
washington - the pentagon for the first time will require military bases worldwide to offer emergency contraception or the so-called morning-after pill, a military spokeswoman said thursday. the decision follows a recommendation by an independent
Pentagon entrance to reopen Monday
Mar 6th, 2010 - Washington Post
the entrance to the pentagon at the site where the shooting occurred thursday night will reopen monday, officials said. the entrance, adjacent to the pentagon metro transit center, will open for normal operations at 5 a.m. monday, according
Right resists link to Pentagon incident
Mar 6th, 2010 - POLITICO
when john patrick bedell, killed this week in a shoot-out with police at the pentagon, was revealed to have left behind a rambling trail of anti-government screeds, conservative commentators reacted with another collective cringe
Pentagon shooter little known by neighbors
Mar 6th, 2010 - Houston Chronicle
at the pentagon this week. family and friends now paint a portrait of a troubled man who sank deep into mental illness and anti-government rants, even as his mother - a nursing instructor - tried to seek help. "the family tried

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Pentagon videos from YouTube:

2:06
The pentagon was not hit by a airliner. See for yourself
The math is so simple a second grader could do it. There is no way an airliner fit through the hole that was left in the pentagon on September 11th
6:16
911 Case Study: Pentagon Flight 77
A short animation with video and photos illustrating the final moments of Flight 77 on September 11, 2001.
1:14
Rare Pentagon 9-11 Surveillance Camera Video of Impact
Rare Pentagon 9-11 Surveilence Camera Video of Impact. Does not seem to indicate a Boeing 757 hit the Pentagon. Doesn't show much of anything. Why won't they show us a 757 hitting the Pentagon? This video was made by nufffrespects

Pentagon from WikiPedia:

In geometry, a pentagon is any five-sided polygon. A pentagon may be simple or self-intersecting. The internal angles in a simple pentagon total 540°. A pentagram is an example of a self-intersecting pentagon.

A regular pentagon has all sides of equal length and all interior angles are equal measure (108°). It has five lines of reflectional symmetry and it has rotational symmetry of order 5 (through 72°, 144°, 216° and 288°). Its Schläfli symbol is {5}. The chords of a regular pentagon are in golden ratio to its sides.

The area of a regular convex pentagon with side length t is given by

A pentagram or pentangle is a regular star pentagon. Its Schläfli symbol is {5/2}. Its sides form the diagonals of a regular convex pentagon – in this arrangement the sides of the two pentagons are in the golden ratio.