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平行四边形到矩形的动态几何画板课件制作
2026-04-08 11:42:12
平行四边形到矩形的动态几何画板课件制作
1.定长邻边。方法可二选一:
①在画板上随意画两条线段;
②用参数设定并画两条线段;
2.画出平行四边形。
①确定平行四边形的一个顶点,以已知线段为半径画两个圆。
②顺次选定点A、点B,在“变换”中点“标记向量”,选定线段AD和点D,
在“变换”中点“平移”,连结CD。
3.画出平行四边形变矩形的过程。
①选定线段AD和点A,在“构造”里面点“垂线”,作AE⊥AD,交小圆于E。
②选定点B,在选定点E,在“编辑”-“操作类按钮”中选“移动”,作点B到点E的移动按钮。
③选定多余的元素,
在“编辑”-“操作类按钮”中选“隐藏/显示”,作多余元素的隐藏按钮。
④按下移动按钮,平行四边形变成矩形。也可手控移动点B。
以下为整个制作过程的录屏。
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年段学习关键:
六年级数学学习关键:分数理解
系列化学习资源:
六年级系列资源
五年级系列资源
四年级系列资源
国学学习资源:
《庄子》逍遥游、齐物论、养生主、人世间
陈鼓应断句版《道德经》纯手工码入[五校版]
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数学中的英语词汇
偈子:空手把锄头,步行骑水牛,人从桥上过,桥流水不流。
毕达哥拉斯的勾股定理与勾股数
平方公式的图形变化
这个圆面积,不是小学生能求的圆的面积。
√a + √b =√2009的故事
海伦是怎样证明三角形面积公式的
"小马喝水"的前世今生
数学史上的转折性故事
好的老师应当向学生展示数学思维的美妙
蒲丰投针——数学的惊艳之美与创新
圆周率问题的前世今生
同余问题的渐进式学习材料
正方体的表面展开图种类
已知矩形中两个三角形的面积,求图中阴影部分的面积
小学数学四至六年级思维题视频集
圆面积的开普勒变化
阿基米德与割圆术
来!来!来!发挥一下你的智商!
课外练习建议
诗和远方:数学运算趣谈
蒲丰投针——数学的惊艳之美与创兴
芯片、戏子与孩子
从两道数学题想到的数学学习与教学问题
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CONNECT:[ UseTime:0.001158s ] mysql:host=127.0.0.1;port=3306;dbname=a_sjds;charset=utf8mb4
SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001747s ]
SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000728s ]
SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.037385s ]
SHOW FULL COLUMNS FROM `set` [ RunTime:0.001444s ]
SELECT * FROM `set` [ RunTime:0.002112s ]
SHOW FULL COLUMNS FROM `article` [ RunTime:0.001616s ]
SELECT * FROM `article` WHERE `id` = 491069 LIMIT 1 [ RunTime:0.006340s ]
UPDATE `article` SET `lasttime` = 1775627794 WHERE `id` = 491069 [ RunTime:0.013250s ]
SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.006762s ]
SELECT * FROM `article` WHERE `id` < 491069 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001276s ]
SELECT * FROM `article` WHERE `id` > 491069 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.003784s ]
SELECT * FROM `article` WHERE `id` < 491069 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.011066s ]
SELECT * FROM `article` WHERE `id` < 491069 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.008544s ]
SELECT * FROM `article` WHERE `id` < 491069 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.024751s ]
0.288863s