尺规作图 三等分角有人说这样可以三等分角,1、任意作一∠ABC(∠ABC小于180度);2、在BA上任意取一点D,在∠ABC内作∠BDE(∠BDE小于∠ABC补角的三分之一),然后再作∠BDE的二倍角∠BDF和三倍
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![尺规作图 三等分角有人说这样可以三等分角,1、任意作一∠ABC(∠ABC小于180度);2、在BA上任意取一点D,在∠ABC内作∠BDE(∠BDE小于∠ABC补角的三分之一),然后再作∠BDE的二倍角∠BDF和三倍](/uploads/image/z/4362768-0-8.jpg?t=%E5%B0%BA%E8%A7%84%E4%BD%9C%E5%9B%BE+%E4%B8%89%E7%AD%89%E5%88%86%E8%A7%92%E6%9C%89%E4%BA%BA%E8%AF%B4%E8%BF%99%E6%A0%B7%E5%8F%AF%E4%BB%A5%E4%B8%89%E7%AD%89%E5%88%86%E8%A7%92%2C1%E3%80%81%E4%BB%BB%E6%84%8F%E4%BD%9C%E4%B8%80%E2%88%A0ABC%EF%BC%88%E2%88%A0ABC%E5%B0%8F%E4%BA%8E180%E5%BA%A6%EF%BC%89%EF%BC%9B2%E3%80%81%E5%9C%A8BA%E4%B8%8A%E4%BB%BB%E6%84%8F%E5%8F%96%E4%B8%80%E7%82%B9D%2C%E5%9C%A8%E2%88%A0ABC%E5%86%85%E4%BD%9C%E2%88%A0BDE%EF%BC%88%E2%88%A0BDE%E5%B0%8F%E4%BA%8E%E2%88%A0ABC%E8%A1%A5%E8%A7%92%E7%9A%84%E4%B8%89%E5%88%86%E4%B9%8B%E4%B8%80%EF%BC%89%2C%E7%84%B6%E5%90%8E%E5%86%8D%E4%BD%9C%E2%88%A0BDE%E7%9A%84%E4%BA%8C%E5%80%8D%E8%A7%92%E2%88%A0BDF%E5%92%8C%E4%B8%89%E5%80%8D)
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