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垂径定理是用求赵州桥主桥拱的半径引入的,笔者在教学中发现此题解答过程是有错误的,南于此问题可用垂径定理的推论解,且与弓形有关知识联系密切,所以不用此题引入更为妥当,笔者下面谈谈自己的看法.一、原题及解答呈现你知道赵州桥吗?它是1300多年前我国隋代建造的石拱桥,是我国古代劳动人民勤劳与智慧的结晶.它的主桥拱是圆弧形,它的跨度(弧所对的弦长)为37.4m,拱高(弧的中点到弦的距离)为7.2m,你能求出赵州桥主桥拱的半径吗?
The vertical trail theorem was introduced using the radius of the main bridge arch of Zhaozhou Bridge. The author found that the answering process of this question is wrong in teaching, and the problem can be deduced by the vertical trail theorem in the south, and it is closely related to the bow-shaped knowledge. Therefore, the author does not need to introduce more appropriate, the author will talk about his own views. First, the original question and answer show you know Zhaozhou Bridge? It is more than 1,300 years ago, China’s Sui Dynasty built stone arch bridge, is the ancient Chinese working people The crystallization of diligence and wisdom. Its main arch is arc-shaped, its span (the length of the arc to the chord) is 37.4m, and the height of the arch (the midpoint of the arc to the chord) is 7.2m. Is the radius of the main bridge arch of Zhaozhou Bridge?