第2单元 第2课时 认识平行四边形 （课件PPT）-【优翼·学练优】2022-2023学年二年级数学上册同步备课（苏教版）

苏教版二年级上册 认识平行四边形 第二单元·平行四边形的初步认识 www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com 情境导入 你在生活中见过这样的四边形吗？ www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com 新知探究 你能用两块完全一样的三角尺拼出这样的四边形吗？ www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com 新知探究 像这样的四边形是平行四边形。 www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com 想想做做 1.把平行四边形涂上颜色。 3 1 2 4 5 www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com 想想做做 2 .在钉子板上围出两个不同的平行四边形。 （答案不唯一） www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com 想想做做 3.你能在下面的图形中找到平行四边形吗？画一画。 （答案不唯一） www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com 想想做做 4.你能用6根同样长的小棒摆出平行四边形吗？ 用8根同样长的小棒能摆出平行四边形吗？ （答案不唯一） www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com 想想做做 5.照样子用4根木条钉一个长方形框，再拉一拉，你有什么发现？ 发现：长方形变成了平行四边形，平行四边形具有易变形的特点。 www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com 通过这节课的学习活动，你有什么收获？ 1.用两个完全一样的三角形可以拼成一个平行四边形。 2.平行四边形具有不稳定性，易变形。 课堂小结 www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.