Name the regular polygon, Hexagon, Heptagon, Octagon, How many number of straight sides of this polygon, 5, 6, 7, How many number of symmetrical axes of this polygon, 1, 2, 3, How many number of corners of this polygon?, 6, 7, 5, How many number of diagonal of this polygon?, 5, 6, 20, How many number of corners of this polygon?, 7, 5, 20

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