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求组合图形的面积系列之一 等量代换法求面积

人教版小学数学五年级上册第五单元. 求组合图形的面积系列之一 等量代换法求面积. 临川三小 马能胜 联系方式：QQ1623662858. 例：如图两个同样的直角三角形重叠在一起，求阴影部分的面积。（单位：厘米）. ∵ S △ABC =S △DEF. S △ABC － S △ DOC S △DEF － S △DOC. = ∴ S 阴影 =S 梯OEFC. ∵ S 阴影 =S 梯OEFC. 上底OC=10 － 4=6厘米 S 梯OEFC =（上底 ＋ 下底） ×高÷2

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求组合图形的面积系列之一 等量代换法求面积

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  1. 人教版小学数学五年级上册第五单元 求组合图形的面积系列之一 等量代换法求面积 临川三小 马能胜 联系方式：QQ1623662858

  2. 例：如图两个同样的直角三角形重叠在一起，求阴影部分的面积。（单位：厘米）

  3. ∵S△ABC=S△DEF S△ABC－S△DOC S△DEF－S△DOC = ∴S阴影=S梯OEFC

  4. ∵S阴影=S梯OEFC 上底OC=10－4=6厘米 S梯OEFC =（上底＋下底）×高÷2 =（6＋10）×2÷2 =16（平方厘米） ∴ S阴影=16（平方厘米） 答：阴影部分的面积是16㎝2。 2

  5. 谢谢观看

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