第7章平面图形的认识（二）

• 作 者: 李明生
• 机 构: 江苏省南通市第一初级中学,
• 出 处: 初中生世界
• 发表日期: 2014年13期

名师箴言几何研究的是图形的形状、大小和位置关系.比如,“三线八角”只是一种特殊的位置关系,但并不一定有大小关系.平行线的性质和判定往往与“三线八角”有关,注意体会位置关系与数量关系之间的内在联系.一个数学问题的发现、提出和分析、解决,往往要经历观察、归纳、猜想、证实等过程.本章中“探索直线平行线的条件”“探索平行线的性质”“三角形或多边形的内、外角和”

Proverbs geometry teacher is the shape, size and location of the relationship between the graph.For example, “three-line eight angle ” is only a special positional relationship, but not necessarily the size of the relationship between the nature and determination of parallel lines often Anise “, pay attention to understand the relationship between the location and the relationship between the quantity of a mathematical problems found, proposed and analyzed, often go through the observation, induction, conjecture, confirmation process.In this chapter Line conditions ”“ Explore the nature of parallel lines ”“ Triangle or polygon inside and outside corner and ”