The pentagon opened in 1887.
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It's an irregular pentagon. It could be an envelope with its flap open.
It was named after a pentagon, it wasn't the 'Pentagon' that named the 'pentagon'.
It looks like an envelope with the flap wide open.
Hexagon * * * * * A pentagon
The syllabication of "pentagon" is pen-ta-gon. It consists of three syllables, with the first syllable "pen" and the last syllable "gon" being closed syllables, while "ta" is an open syllable.