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球是我们日常生活中十分熟悉的一种几何体 ,球的影子连小朋友们也见得多 ,似乎不屑一顾 .但用数学的眼光去作一番观察 ,却能激发同学们思考的兴趣 ,发现它能编织出立几、解几和三角基础知识交汇点上的富有价值的应用问题 ,是同学们课外进行研究性学习的一个实践课题 .下面证明
The ball is a kind of geometry that we are very familiar with in our daily life. The shadow of the ball is even more visible to the children. It seems to be dismissive. But using mathematics to make an observation can inspire the students’ interest in thinking and discover it. It is a practical topic for students to carry out research-based learning outside the classroom by knitting the valuable application questions on the intersection of several points, solutions and triangle basic knowledge.