工作就用美篇工作版","guide_search_desc":"海量模板范文,一键做同款 工作就用美篇工作版","img_beautify_switch":0,"ad_free":0,"text_direction":2,"template":{},"container":{},"redirect":{"redirect_type":1,"img_url":false,"link_url":"/wap/downloadpage/backpage","button_bg_color":false,"button_desc":false,"redirect_desc":false},"edit_date_str":"更新于 2021-11-14","current_time":1743950758,"font_name":"","rcmd_meipian":0,"hide_article_link":0,"from_wechat":false,"topk_keywords":[{"name":"平行线","score":0.673401},{"name":"直线","score":0.37471},{"name":"直尺","score":0.27381},{"name":"一条","score":0.204045},{"name":"相交","score":0.201636},{"name":"尺子","score":0.19991},{"name":"铅笔","score":0.187948},{"name":"一组","score":0.186191},{"name":"两条","score":0.166874},{"name":"接着","score":0.162453}],"music_name":"","origin_status":0,"password_v2":"","font_id":0,"title_style":"","rich_text_title":"","enable_download":1,"cover_thumb":"https://ss-mpvolc.meipian.me/users/204674759/1636873291253__jpg.heic","has_video":false,"gift_switch":1,"enable_watermark":1,"content":{"article_id":305080662,"content":[{"audio_music_id":0,"source":0,"text":"
一、问题提出
这个单元我们学习了平行线,在同一个平面内不相交的两条直线叫做平行线,也可以说这两条直线互相平行,今天就来研究,怎么画平行线
二、研究方法
我准备用画图法、测量法、拼摆法等。
三、研究过程
方法一:先用皮筋捆好两支铅笔,铅笔头要齐平,接着把尺子对准两只铅笔,然后两支铅笔一画,最后一组平行线就画好了。
方法二:先把一把直尺牢牢按住,不能动,接着用一支铅笔在直尺上一条边画一条直线,在在直尺的下一条边画一条直线,最后把尺子拿开,一组平行线就画好了。
方法三:先用量角器画一条直线,接着用直角边对准90度角,做一个标记,然后画好这条直线,接着再朝着这个方向再画一条直线,最后一组平行线 就画好了。
方法四:先像任意的方向画一条直线,然后把直尺与这条线重合,期间不能移动,接着再拿一把尺子,和直尺对准,然后上下移动画二条直线,最后一组平行线就画好了,方法四是最特别的, 可以任意用两把尺子组合,只要能画的都可以。
为什么 :为什么在平面内 这两条平行线却不会相交呢?我先换了一组很短的平行线,接着慢慢延长,慢慢延长,直到演唱延长到纸的边缘,它还是没有相交,我又开始在里面画垂线,每一条垂线都是一样长的,哦,我明白了,之所以两条直线不相交,是因为两条平行线之间的距离都相同,所以他们不管怎么样,都不会相交。
有平行线的东西有很多比如长方形窗户的对边、长方形封面的对边、奖状的对边,等等,有很多东西都是对边相等的,几乎列举不完,可见平行线在我们生活中多么重要啊!
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一、问题提出
这个单元我们学习了平行线,在同一个平面内不相交的两条直线叫做平行线,也可以说这两条直线互相平行,今天就来研究,怎么画平行线
二、研究方法
我准备用画图法、测量法、拼摆法等。
三、研究过程
方法一:先用皮筋捆好两支铅笔,铅笔头要齐平,接着把尺子对准两只铅笔,然后两支铅笔一画,最后一组平行线就画好了。
方法二:先把一把直尺牢牢按住,不能动,接着用一支铅笔在直尺上一条边画一条直线,在在直尺的下一条边画一条直线,最后把尺子拿开,一组平行线就画好了。
方法三:先用量角器画一条直线,接着用直角边对准90度角,做一个标记,然后画好这条直线,接着再朝着这个方向再画一条直线,最后一组平行线 就画好了。
方法四:先像任意的方向画一条直线,然后把直尺与这条线重合,期间不能移动,接着再拿一把尺子,和直尺对准,然后上下移动画二条直线,最后一组平行线就画好了,方法四是最特别的, 可以任意用两把尺子组合,只要能画的都可以。
为什么 :为什么在平面内 这两条平行线却不会相交呢?我先换了一组很短的平行线,接着慢慢延长,慢慢延长,直到演唱延长到纸的边缘,它还是没有相交,我又开始在里面画垂线,每一条垂线都是一样长的,哦,我明白了,之所以两条直线不相交,是因为两条平行线之间的距离都相同,所以他们不管怎么样,都不会相交。
有平行线的东西有很多比如长方形窗户的对边、长方形封面的对边、奖状的对边,等等,有很多东西都是对边相等的,几乎列举不完,可见平行线在我们生活中多么重要啊!
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