pentagon
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last updated: 2005-10-30 |
The pentagon is a five-sided polygon.
 The building of the American Department of War is named the 'Pentagon',
while its form is a pentagon.
Some viruses have the form of a regular pentagon,
which is a five-sided regular polygon.
The pentagonal numbers 1, 5, 12 and so so can be found by surrounding pentagons with
larger pentagons.
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