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课件制作:刘步忠 主讲教师:刘步忠

人教版五年级上册第五单元. 组合图形系列 ——. 巧求阴影部分面积. 课件制作:刘步忠 主讲教师:刘步忠. www.jxteacher.com/liubuzhong. A. D. E. F. H. B. G. C. 图中两个正方形的面积分别是8厘米和6厘米, 求阴影部分的面积。. 总面积—空白部分的面积. 总面积:. 8×8+6×6. =100cm 2. 三角形ADE的面积:. 8×(8-6)÷2=8cm 2. 三角形EFG的面积:. 6×6÷2=18cm 2. 三角形ABG的面积:. (8+6)×8÷2=56cm 2. 阴影部分的面积:.

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课件制作:刘步忠 主讲教师:刘步忠

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  1. 人教版五年级上册第五单元 组合图形系列—— 巧求阴影部分面积 课件制作:刘步忠 主讲教师:刘步忠 www.jxteacher.com/liubuzhong

  2. A D E F H B G C 图中两个正方形的面积分别是8厘米和6厘米, 求阴影部分的面积。 总面积—空白部分的面积 总面积: 8×8+6×6 =100cm2 三角形ADE的面积: 8×(8-6)÷2=8cm2 三角形EFG的面积: 6×6÷2=18cm2 三角形ABG的面积: (8+6)×8÷2=56cm2 阴影部分的面积: 100-(8+18+56)=18cm2

  3. 图中两个正方形的面积分别是8厘米和6厘米, 求阴影部分的面积。 梯形ABCE的面积: D A (6+8)×8÷2=56cm2 三角形ABG的面积: E F (6+8)×8÷2=56cm2 同时减去梯形ABCH的面积 H 所以三角形AEH和三角形HCG的面积相等 B G C 阴影部分面积=小正方形面积的一半 6×6÷2=18cm2

  4. www.jxteacher.com/liubuzhong 谢谢指导! 铅山县实验小学 刘步忠

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