已知:
是等腰直角三角形,点E在斜边
所在的直线上,连接
,以
为腰作等腰直角三角形
,将线段
绕点C顺时针旋转
,得到线段
,连接
,
.
上时,求证:
;
(2)如图②,当点E在线段
延长线上时,(1)中的结论还成立吗?如果成立,请说明理由;如果不成立,请写出正确的结论,并说明理由;
(3)当点E在线段
延长线上时,试判断四边形
的形状,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87c0bfeadcf17b2a45896071f07a4a5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5458b35fce2f91f5bb7c22ba30ae63c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98420af13aa531313d993d0216a640e0.png)
(2)如图②,当点E在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(3)当点E在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94a5a2949b3d520ed03d57126c7d4d8d.png)
更新时间:2024-05-13 04:01:37
|
相似题推荐
解答题-证明题
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适中
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【推荐1】如图,
,
都是等边三角形,
,
.
![](https://img.xkw.com/dksih/QBM/2021/12/10/2869428874911744/2873603299336192/STEM/b95a20aa-7b07-45a4-b27b-2ae2c51d964a.png?resizew=223)
(1)求证:
;
(2)猜想
,
的位置关系,并证明;
(3)若将“
,
”改为“
,
”,其他条件不变,请直接写出
的度数__________(用含
的式子表示).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80651f797ab9dccfd7163c605b091ad5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d19b7ec984cd85544c370c79e8ee1f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cff453bd9b82c6f07acdfc8f9334d49b.png)
![](https://img.xkw.com/dksih/QBM/2021/12/10/2869428874911744/2873603299336192/STEM/b95a20aa-7b07-45a4-b27b-2ae2c51d964a.png?resizew=223)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a1371c96162b62b4735829affef0420.png)
(2)猜想
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(3)若将“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d19b7ec984cd85544c370c79e8ee1f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cff453bd9b82c6f07acdfc8f9334d49b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e41e5896a9a6836e71b0a60aecb4d233.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3517f9f6e6f7b9496e7faa7cafc1cbfb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
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【推荐2】为了解学生对所学知识的应用能力,某校老师在七年级数学兴趣小组活动中,设置了这样的问题:因为池塘两端
,
的距离无法直接测量,请同学们设计方案测量
,
的距离,甲、乙两位同学分别设计出了如下两种方案:
,
的点
,连接
并延长到点
,连接
并延长到点
,使
,
,连接
,测出
的长即可.
乙:如图2,先确定直线
,过点
作直线
,在直线
上找可以直接到达点
的一点
,连接
,作
,交直线
于点
,最后测量
的长即可.
(1)甲、乙两同学的方案哪个可行?并说明理由.
(2)请将不可行的方案稍加修改使之可行,你的修改是: ,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07e37b122a7273e1251ea3860e74c896.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12d8da10b2137a1e87801556a313e625.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c26ffe2f28d8694b1f3b622fba8f5ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f183d7028b2b2cd23edccc87e1aaf59d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cdd9f345915ae742ed3dcd3f9678264.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cdd9f345915ae742ed3dcd3f9678264.png)
乙:如图2,先确定直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0213c5787a5a6b38d11bceca5567f67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0213c5787a5a6b38d11bceca5567f67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f96461af9193d5d7867ddf8fcbefcaec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ff1ce90516ed210411f9c5d481d38a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
(1)甲、乙两同学的方案哪个可行?并说明理由.
(2)请将不可行的方案稍加修改使之可行,你的修改是: ,请说明理由.
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【推荐1】已知:如图
为
的直径,弦
、
相交于点P,
(2)若
,
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/037b342a682cbd4241855a243da3c016.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb5b12692517a39c320f99a479eb055.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
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【推荐2】如图,在四边形
中,
,
,
,
,
,动点P从点B出发,沿射线
的方向以每秒
的速度运动,动点Q从点A出发,在线段
上以每秒
的速度向点D运动,点P,Q分别从点B,A同时出发,当点Q运动到点D时,点P随之停止运动,设运动的时间t(秒).
(1)则
,
(用含t的代数式表示);
(2)当t为何值时,以C,D,Q,P为顶点的梯形面积等于
?
(3)是否存在点P,使
是等腰三角形?若存在,请求出所有满足要求的t的值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4adf90a8c2b29334cdc5aa5b554991f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60d9142db4dd2ef151bf3d4a63afb61e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ede0bcdce110dbe6f46a4a7ba7e6059d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b79850d6b00a67110e77a33d1c46b5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fccdfbd8fd6f54646363cd44e47d7c71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c78d0ab561d0c9bb9099772c596af8bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/048b61a5fb5f420c6d7de88db5bc3aa5.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/12/2df47923-2612-4863-96bd-bd3af2c26b74.png?resizew=544)
(1)则
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5740b4ab7c60534052033977fb20e7c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33e7d551cca653e2d638c8cab4c2fda8.png)
(2)当t为何值时,以C,D,Q,P为顶点的梯形面积等于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a834fff6a787e220ea98b175ddfe8a6.png)
(3)是否存在点P,使
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecd3355d3bee7e168af3bec0662b7dd8.png)
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【推荐1】如图,抛物线
与x轴交于A、B两点,与y轴交于点C,且OA=2,OC=3.
(1)求抛物线的解析式;
(2)作Rt△OBC的高OD,延长OD与抛物线在第一象限内交于点E,求点E的坐标;
(3)①在x轴上方的抛物线上,是否存在一点P,使四边形OBEP是平行四边形?若存在,求出点P的坐标;若不存在,请说明理由;
②在抛物线的对称轴上,是否存在上点Q,使得△BEQ的周长最小?若存在,求出点Q的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0c9800e4b992044d16681e77ff6563c.png)
(1)求抛物线的解析式;
(2)作Rt△OBC的高OD,延长OD与抛物线在第一象限内交于点E,求点E的坐标;
(3)①在x轴上方的抛物线上,是否存在一点P,使四边形OBEP是平行四边形?若存在,求出点P的坐标;若不存在,请说明理由;
②在抛物线的对称轴上,是否存在上点Q,使得△BEQ的周长最小?若存在,求出点Q的坐标;若不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/2019/3/30/2171814099730432/2176384853647360/STEM/fefec849c3d642d09207befc04266ca9.png?resizew=202)
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【推荐2】如图,菱形
对角线
与
的交于点
,过点
作
,过点
作
,
与
相交于点
.
的长______.
(2)求证四边形
是矩形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/555a8e5ed4f21f53d32b26d6fd3be92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46d9a91110117aea38a46bb4e006bc14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cccde778c619848076ea8c11b0b13a12.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
(2)求证四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5e89d43151016343d2ab6c4851565e7.png)
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【推荐1】问题情景:如图,在△ABC中,∠ACB=90°,AC=BC,点P为直线AB上一点(不与点A,B重合),过点P作射线PM交直线AC于点M,将射线PM绕点P顺时针旋转α得到射线PN,交直线BC于点N.
(1)观察猜想:如图(1),若点P在线段AB上,点M在线段AC上,射线PN交线段AC的延长线于点G,α=45°,AP=BN.填空:线段PM与PN的数量关系是 ;∠APM与∠AGP的数量关系是
(2)类比探究:如图(2),若点P在线段BA的延长线上,点M在线段AC上,射线PN交线段CA的延长线于点G,α=45°,AP=nBN,请写出线段PM与PN的数量关系(用含n的式子表示)及∠APM与∠AGP的数量关系,并就图(2)的情形说明理由.
(1)观察猜想:如图(1),若点P在线段AB上,点M在线段AC上,射线PN交线段AC的延长线于点G,α=45°,AP=BN.填空:线段PM与PN的数量关系是 ;∠APM与∠AGP的数量关系是
(2)类比探究:如图(2),若点P在线段BA的延长线上,点M在线段AC上,射线PN交线段CA的延长线于点G,α=45°,AP=nBN,请写出线段PM与PN的数量关系(用含n的式子表示)及∠APM与∠AGP的数量关系,并就图(2)的情形说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/29/3a84f374-c79c-4e14-be55-00ddfb3b839c.png?resizew=480)
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【推荐2】已知Rt△ABC中,∠ACB=90°,AC=4,∠B=30°,把边AC绕点A逆时针旋转,点C的对应点D落在边AB上.
(1)如图①,则线段AD的长为 ,旋转角的大小为 ,点D到直线BC的距离为 .
(2)点P是直线BC上的一个动点,连接AP,把△ACP绕点A逆时针旋转,使边AC与AD重合,得△ADQ,点Q与点P是对应点.
①如图②,当点P在边CB上,且CP=3
时,求PQ的长;
②当点P在线段BC的延长线上,且点Q到直线BC的距离为
时,求CP的长(直接写出结果即可).
(1)如图①,则线段AD的长为 ,旋转角的大小为 ,点D到直线BC的距离为 .
(2)点P是直线BC上的一个动点,连接AP,把△ACP绕点A逆时针旋转,使边AC与AD重合,得△ADQ,点Q与点P是对应点.
①如图②,当点P在边CB上,且CP=3
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
②当点P在线段BC的延长线上,且点Q到直线BC的距离为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://img.xkw.com/dksih/QBM/2020/12/16/2615170084470784/2673630012071936/STEM/01c4e45245de452b92945a036efd9e37.png?resizew=276)
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