几何是研究物体的形状、大小和位置关系的学科。小学几何初步知识的教学,是学习几何的启蒙教育,也是中学几何课程入门基础。几何初步知识的内容,主要是五线(直线、线段、射线、垂线、平行线),五角(直角、平角、锐角、钝角、周角),七形(长方形、正方形、三角形、平行四边形、梯形、圆形、扇形),四体(长方体、正方体、圆柱体、圆锥体)的认识和计算(主要是周长、面积和体积的计算)。这些, Geometry is a discipline that studies the shape, size, and location of objects. Elementary geometry elementary education, learning geometry is the enlightenment education, but also high school geometry course entry foundation. The initial contents of geometry are mainly five lines (straight line, line segment, ray, vertical line and parallel line), pentagon (right angle, flat angle, acute angle, obtuse angle and perimeter angle), heptagon (rectangle, square, triangle, parallelogram, Trapezoid, circle, fan), four body (cuboid, cube, cylinder, cone) understanding and calculation (mainly the perimeter, area and volume calculation). These ones,