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人教版初三几何第三册教材第 1 74页例 4是关于求新月形面积的问题 .它的解题方法具有普遍意义 ,在教学中可以利用它去解决相关的问题 ,也可以用它的结论去解决有关求新月形面积的问题 .解法比较直观、简捷 .现举例说明 ,仅供参考 .原题 :(几何第三册P1 74例 4)已知 :如图 1 .
The third edition of the third edition of the teaching book is the question about the area of the crescent moon. Its problem solving method has universal significance. It can be used in teaching to solve related problems. It can also be used. Its conclusion to solve the problem of seeking new moon-shaped area. Solution is more intuitive and simple. Now for illustration, for reference only. Original question: (Geometry Book P1 74 cases 4) Known: Figure 1.