1) The number of sides those are closed by (5 in Pentagon and 6 in Hexagon). 2) The number of vertices ( 5 vs 6). 3) For a Regular Pentagon, the internal angles are 108 and for hexagon those are 120 degrees. 4) We have a building named after Pentagon but not a Hexagon. read more

Wikipedia:

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2D Polygon Shapes

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Hexagon vs Pentagon

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