小学生对“空间与图形”即几何的学习有一定困难,对作三角形的高特别是钝角三角形的高比较难掌握。本文的创新之处合理运用转化的数学思想,创新“景形转化”的教学方法即合理运用从实景图转化成几何图形,引导学生从生活实际场景中转化成抽象的几何图形。从而大大提高了教学成效。 Pupils on the “space and graphics ” geometric learning that is difficult, for the high triangle, especially the obtuse triangle is more difficult to master. The innovation of this paper Reasonable use of mathematical transformation of the idea of ​​innovation “landscape transformation ” teaching method that is the rational use of the real map into a geometric figure, guide students from the actual scene of life into abstract geometric figure. Thus greatly improving the effectiveness of teaching.