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初三学生在复习时 ,对凸多边形面积的求解问题普遍感到困惑 ,本文通过探索几例不规则凸多边形的等积变换 ,帮助学生梳理知识点 ,提高求解此类问题的能力 .例 1 将凸五边形ABCDE变成与之等积的四边形BCDF .作图步骤 :(见图 1)(1)连结BE ;(2 )过点A作AF∥BE交DE的延长线于点F ;(
In the third grade, students generally feel puzzled about the problem of solving convex polygon area. This article explores several equal cases of irregular convex polygons to help students sort out knowledge points and improve the ability to solve such problems. Example 1 Convexity The pentagon ABCDE becomes a quadrilateral BCDF with a quadrature product. The mapping steps: (see Figure 1) (1) link BE; (2) pass point A for AF∥BE to DE extension line at point F; (