3 下 — 影片（示範）：用長方形紙剪出三角形
Synopsis
如何用長方形紙剪出三角形？ 00:00 用長方形紙剪出三角形00:11 第一個方法：沿對角剪00:28 第二個方法：先對摺，再沿對角 ...
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