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opposite sides and angles of hexagon

作者:Arthur Lee
主题:角, 多边形
Open the task sheet: https://www.evernote.com/l/AANyIWZaqvBBaIUzGt7b_T6DZZjW3Og9zOA
more info: https://dl.dropboxusercontent.com/u/4210789/me/mini/hexagons/index.html

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