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“平行四边形的性质”是人教版教材第十九章第一节的内容,它是在学生掌握了平行线、三角形及简单图形的平移和旋转等几何知识的基础上学习的.研究平行四边形既是解决生活中实际问题的需要,也是学生深刻理解前面知识的需要.学习它不仅是对已学平行线、三角形等知识的综合应用和深化,又是下一步学习矩形、菱形、正方形及梯形等知识的基础和基本工具,例如,把梯形看作平行四边形和三角形的组合.平行四边形概念能够统领各种特殊四边形,教
“The Nature of Parallelograms” is the first section of Chapter XIX of the PEP textbook, which is based on students’ knowledge of the geometric knowledge of parallel lines, triangles and the translation and rotation of simple figures. Parallelogram is not only the need to solve practical problems in life, but also students need a deep understanding of the previous knowledge.Studying it not only is the combination and deepening of knowledge parallel lines, triangles, etc., but also the next step to learn the rectangle, diamond, square and Trapezoidal and other knowledge of the basic and basic tools, for example, the trapezoidal as a combination of parallelograms and triangles. Parallelogram concept can command a variety of special quadrilateral, teach