【摘 要】
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本文对有关“弦”的分类讨论问题作了研究,现说明如下.1.弦所对的弧和圆周角如图1,AB 为⊙O的弦,弦AB 所对的弧为劣弧和优弧,弦所对的圆周角为∠ACB和∠ADB,因此,弦所对的弧
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本文对有关“弦”的分类讨论问题作了研究,现说明如下.1.弦所对的弧和圆周角如图1,AB 为⊙O的弦,弦AB 所对的弧为劣弧和优弧,弦所对的圆周角为∠ACB和∠ADB,因此,弦所对的弧和
In this paper, we have studied the classification and discussion of the “chords”. The explanations are as follows. 1. The arc and the circumferential angle of the chord are shown in Fig. 1. AB is the chord of ⊙O, and the chord of the chord AB is the inferior arc. And for the arc, the circumferential angles that the strings are facing are ∠ACB and ∠ADB, so the arcs and
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