答網友
其他方法，見：
圖片來源：多謝高登先～
http://forum15.hkgolden.com/view.aspx?type=EP&message=5483432
想多研究等邊三角形，這裡有本 mysteries of the equilateral triangle：
http://www.m-hikari.com/mccartin-2.pdf
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