File:有二横直線或正或偏任加一縱線若三線之間同方兩角小於兩直角則此二横直線愈長愈相近必至相遇.svg
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![File:有二横直線或正或偏任加一縱線若三線之間同方兩角小於兩直角則此二横直線愈長愈相近必至相遇.svg](https://upload.wikimedia.org/wikipedia/commons/thumb/8/8b/%E6%9C%89%E4%BA%8C%E6%A8%AA%E7%9B%B4%E7%B7%9A%E6%88%96%E6%AD%A3%E6%88%96%E5%81%8F%E4%BB%BB%E5%8A%A0%E4%B8%80%E7%B8%B1%E7%B7%9A%E8%8B%A5%E4%B8%89%E7%B7%9A%E4%B9%8B%E9%96%93%E5%90%8C%E6%96%B9%E5%85%A9%E8%A7%92%E5%B0%8F%E6%96%BC%E5%85%A9%E7%9B%B4%E8%A7%92%E5%89%87%E6%AD%A4%E4%BA%8C%E6%A8%AA%E7%9B%B4%E7%B7%9A%E6%84%88%E9%95%B7%E6%84%88%E7%9B%B8%E8%BF%91%E5%BF%85%E8%87%B3%E7%9B%B8%E9%81%87.svg/512px-%E6%9C%89%E4%BA%8C%E6%A8%AA%E7%9B%B4%E7%B7%9A%E6%88%96%E6%AD%A3%E6%88%96%E5%81%8F%E4%BB%BB%E5%8A%A0%E4%B8%80%E7%B8%B1%E7%B7%9A%E8%8B%A5%E4%B8%89%E7%B7%9A%E4%B9%8B%E9%96%93%E5%90%8C%E6%96%B9%E5%85%A9%E8%A7%92%E5%B0%8F%E6%96%BC%E5%85%A9%E7%9B%B4%E8%A7%92%E5%89%87%E6%AD%A4%E4%BA%8C%E6%A8%AA%E7%9B%B4%E7%B7%9A%E6%84%88%E9%95%B7%E6%84%88%E7%9B%B8%E8%BF%91%E5%BF%85%E8%87%B3%E7%9B%B8%E9%81%87.svg.png?20160208173230)
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