如图,在
中,
的平分线交
于点D,
,
.
的形状,并说明理由;
(2)若
,且
,求四边形
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/066cd386723885c535ea720f5817847a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6a04b6b10b8b2788f026b95ce367d63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09dfa01bffe6f5d08931c75970c16b69.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45defd67fb990dd6ea00274861c0aa59.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09dfa01bffe6f5d08931c75970c16b69.png)
更新时间:2024-03-27 08:36:30
|
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解答题-问答题
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【推荐1】如图,在△ABC中,∠ACB=90°,AB=10cm,BC=6cm,若点P从点B出发,以每秒4cm的速度沿折线B→A→C→B运动,设运动时间为t秒(
).
![](https://img.xkw.com/dksih/QBM/2022/1/12/2893006843699200/2949487517696000/STEM/cc403d84-ac09-44ba-8444-ebbfd4659e53.png?resizew=133)
(1)若点P在AC上,求出此时线段PC的长(用含t的代数式表示);
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(1)若点P在AC上,求出此时线段PC的长(用含t的代数式表示);
(2)在运动过程中,当t为何值时,△BCP是以PB为底边的等腰三角形.
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【推荐2】如图,四边形ABCD的四个顶点都在网格上,且每个小正方形的边长都为1.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/27/a63f17fc-4150-406d-abd4-4f75ff9e07ac.png?resizew=243)
(1)BC= ,AD= ,连接BD,判断△ABD的形状为 ;
(2)求四边形ABCD的面积.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/27/a63f17fc-4150-406d-abd4-4f75ff9e07ac.png?resizew=243)
(1)BC= ,AD= ,连接BD,判断△ABD的形状为 ;
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解答题-作图题
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【推荐1】在△ABC中,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
(1)作线段AC的垂直平分线1,交AC于点O:(保留作图痕迹,请标明字母)
(2)连接BO并延长至D,使得
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
(1)作线段AC的垂直平分线1,交AC于点O:(保留作图痕迹,请标明字母)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fce05f91ce17863abc8a5a8f6002b75.png)
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【推荐2】如图,四边形ABCD中,对角线AC、BD相交于点O,
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(2)若∠ACB=30°,AB=1,求①∠AOB的度数;②四边形ABCD的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff49e657cd2b31203ab832c83198bbee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/091e434eba0fbbaa91d89a2d232aa17e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/31/382b8f4a-dc27-4579-af7c-e44b36a0037a.png?resizew=135)
(1)求证:四边形ABCD是矩形.
(2)若∠ACB=30°,AB=1,求①∠AOB的度数;②四边形ABCD的面积.
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解答题-证明题
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【推荐3】下面是课本第54页中的部分内容,请认真阅读,并完成相应的任务.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/27/1a9fc3a6-0e94-4497-bfcc-5031a0e60031.png?resizew=628)
任务:
(1)填空:工人师傅测量对边长度相等,是为了确保它的形状是_______;再测量它的对角线相等,就确保了它是矩形.这里主要依据了矩形的一个判定定理,即_______.
(2)请证明(1)中矩形的判断定理.(先画出图形,写出已知、求证,再给出证明)
已知:_______________________
求证:_______________________
证明:_______________________
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/27/1a9fc3a6-0e94-4497-bfcc-5031a0e60031.png?resizew=628)
任务:
(1)填空:工人师傅测量对边长度相等,是为了确保它的形状是_______;再测量它的对角线相等,就确保了它是矩形.这里主要依据了矩形的一个判定定理,即_______.
(2)请证明(1)中矩形的判断定理.(先画出图形,写出已知、求证,再给出证明)
已知:_______________________
求证:_______________________
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解答题-证明题
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【推荐1】如图,在四边形ABCD中,AB=DC,E,F,G,H分别是AD,BC,BD,AC的中点.
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解答题-证明题
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【推荐2】已知,在四边形
中,
是对角线
上一点,
,以
为直径的
与边
相切于点
.
点在
上,连接
.
![](https://img.xkw.com/dksih/QBM/2019/4/17/2184464355606528/2185291397693440/STEM/458388721d53420b8a5a99bb92d933d5.png?resizew=206)
(1)求证:
;
(2)若
,求证:四边形
是菱形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://img.xkw.com/dksih/QBM/2019/4/17/2184464355606528/2185291397693440/STEM/458388721d53420b8a5a99bb92d933d5.png?resizew=206)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e6dea20916d5499339cf10839eee783.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a98c8e36238ad90378e724466fcb6023.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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