“图形与几何”小学数学教育重要的知识领域,在这个领域中的“测量”方面,第一学段(1~3年级)接触了长方形、正方形的周长和面积计算。第二学段(4~6年级)在此基础上又学习了平行四边形、三角形、梯形的面积;长方体、正方体的表面积和体积(容积);圆的周长和面积;圆柱、圆锥的体积等。第二学段的图形增多,难度加大,图形间的内在关系复 “Graphics and Geometry ” The important area of ​​knowledge in primary mathematics education, in the field of “measurement”, the first semester (grades 1-3) came into contact with the calculation of the rectangle, the circumference of the square and the area. In the second semester (grades 4-6), we learned the area of ​​parallelogram, triangle and trapezoid; the surface area and volume (volume) of cuboid and cube; the circumference and area of ​​circle; the volume of cylinder and cone . The second section of the graphics increased, the difficulty increases, the internal relations between graphics complex