In geometry, a heptagon is a polygon with seven sides and seven angles. In a regular heptagon, in which all sides and all angles are equal, the sides meet at an angle of 5π/7 radians, 128.
例句与用法
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Electronic transport properties of single - wall carbon nanotube with pentagon - heptagon - pair defect 七边形缺陷的单壁纳米碳管的输运性质研究
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