如图,Rt△ABC中,∠C=90°,AD平分∠BAC,交BC于点D,CD=1.5,BD=2.5.
(2)求线段AC的长.
(2)求线段AC的长.
更新时间:2022-07-06 23:00:16
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解答题-问答题
|
适中
(0.65)
【推荐1】已知
为
的中线,
为线段
上一点.
![](https://img.xkw.com/dksih/QBM/2021/7/11/2761844549058560/2765944778645504/STEM/c7e585ce-2a9f-4ebd-9366-79e93470d97d.png)
(1)如图1,若
,
的周长为10,求
的周长;
(2)若
的面积为20,
,请在图2 中作
的
边上的高,并求出点
到直线
的距离;
(3)如图3,若
,
,射线
平分
,点
是射线
上一点,且直线
与
的一条边所在的直线垂直,请直接写出
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://img.xkw.com/dksih/QBM/2021/7/11/2761844549058560/2765944778645504/STEM/c7e585ce-2a9f-4ebd-9366-79e93470d97d.png)
(1)如图1,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/379d626fa93cf37ad9c808b37cb033a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7ac5396c5ea442e0364b50c1db3d2da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c15514bc735fe4b744672edefe00009c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d71e6ea7333dbc78d0a7b9bc3892f940.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c15514bc735fe4b744672edefe00009c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(3)如图3,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9bba485e27230e818f527407f72baa2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dc2ed067420a68283827093ac7281ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/246a86f34603eaf2e6a948681b831b0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fd17a66a2af938c89e46f22e4d893b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c15514bc735fe4b744672edefe00009c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73a34228c2e9340b225b7281383b24d3.png)
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解答题-证明题
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适中
(0.65)
【推荐2】如图,正方形
的边长为
,对角线
相交于点
,
是
的中点,连接
,过点
作
于点
,交
于点
.
(1)求证:
;
(2)求点
到
边的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95bacae35b6e16a0a33c2bdc6bc07df7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73b3c032441543354c154ee67d744abb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd7e284eac4b90bfb327de768a7beef6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e444739e269a94733b2b0598b559313.png)
(2)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/23/9572abe0-7bf6-43f6-9246-a495b1a26713.png?resizew=146)
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【推荐1】已知:如图,在矩形ABCD中,点E在边AB上,点F在边BC上,且BE=CF, EF=DF.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/7/38f41deb-38d5-4fcc-86ec-40b2e182f960.png?resizew=170)
(1)求证:△EBF≌△FCD
(2)判断△EFD是什么三角形?说明理由。
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/7/38f41deb-38d5-4fcc-86ec-40b2e182f960.png?resizew=170)
(1)求证:△EBF≌△FCD
(2)判断△EFD是什么三角形?说明理由。
您最近一年使用:0次
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适中
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【推荐2】已知
与
均为等腰直角三角形,且
.
(1)如图1,当点D,B,C在同一条直线上时,
的延长线与
交于点F,则
的度数为______.
(2)当
与
的位置如图2时,
的延长线与
交于点F,(1)中
的大小是否改变?请说明理由.
(3)如图3,当点A,E,D在同一条直线上时(点A,D在点E的异侧),
与
交于点G,
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f2281cb6df0c3c518ce5ed19a02b57e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86ae31b70c84b0c8bf215843182a8c66.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/2/aba707d7-6460-47bf-b499-d0f5c6b947ed.png?resizew=575)
(1)如图1,当点D,B,C在同一条直线上时,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ed24d7acba0b3a7ebf4d520296424a3.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f2281cb6df0c3c518ce5ed19a02b57e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ed24d7acba0b3a7ebf4d520296424a3.png)
(3)如图3,当点A,E,D在同一条直线上时(点A,D在点E的异侧),
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fbf18a89d2bc8795a4393d02b0f970e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c440a1bf41e523b478a64ad71e1e7966.png)
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解答题-证明题
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适中
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【推荐1】如图,点
在
的边
上,以
为圆心,
为半径的圆与
交于点
,与
交于点
,并且与边
相切于点
,连接
.已知
平分
.
![](https://img.xkw.com/dksih/QBM/2020/3/30/2430688452263936/2431891557392384/STEM/698897192ee848019e83929d91585933.png?resizew=148)
(1)求证:
;
(2)若
,
的半径为3.求阴影部分的面积.(结果保留
和根号)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57e7106619c08f2bcc1d21f846e8a0de.png)
![](https://img.xkw.com/dksih/QBM/2020/3/30/2430688452263936/2431891557392384/STEM/698897192ee848019e83929d91585933.png?resizew=148)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdb2dd10731b99c0f4f89ee957f8a239.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5bc453240418e3bea9c0a11e2db4dbd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86ebba6ed1add0fe647c0226614b9290.png)
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【推荐2】填空:(将下面的推理过程及依据补充完整)
如图,已知:
平分
,
、
,求证:
平分
.
平分
(已知),
∴
__________ (角平分线定义).
∵
(已知),
∴
__________________.
∴
(_________________),
∵
(_________________)
∴_____________
(_________________),
(_________________),
∴_____________
_____________(等量代换).
∴
平分
(_________________).
如图,已知:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43defd54316aac92a3d18d4d400033c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9390a8688fd466fb6b883b0d60dcd872.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6beda2518cf76da94d7ec9a813dcfa82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd25acdc39bf65eaf198f2b10753719.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43defd54316aac92a3d18d4d400033c2.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd25acdc39bf65eaf198f2b10753719.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10e6203eae135b8a2b76a48f9711eef7.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9390a8688fd466fb6b883b0d60dcd872.png)
∴_____________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba2383316308ad0e41faab681929f41f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/191496af8433cf76fc6fc93ecfc98479.png)
∴_____________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6706fe00b4e231e62d9ecbec567d526b.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6beda2518cf76da94d7ec9a813dcfa82.png)
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解答题-问答题
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适中
(0.65)
【推荐1】已知
是
的直径,
是
的弦.
为
的中点,
,求
和
的大小;
(2)如图②,过点
作
的切线交
延长线于点
,连接
,若
是
的直径,
,
,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/fe182142c22def2860792c7c5b6b99f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16d65cecaf8a3dc2953f4109c75a981e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6116be728dae4d202391f448c49a2fcd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/246a86f34603eaf2e6a948681b831b0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57e7106619c08f2bcc1d21f846e8a0de.png)
(2)如图②,过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c15416b74b2ecbcfa38cf34a9ffff730.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b59ab6bf6111dda4a3d428454768b77.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
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名校
【推荐2】如图1,Rt△ABC中,∠ACB=90°,点D、点E分别在边AC、BC上,且DE∥AB. 现将△CDE绕点C逆时针旋转某一角度,点D恰落在边AB上,连接BE.
![](https://img.xkw.com/dksih/QBM/2020/10/9/2567321038938112/2567763640303616/STEM/4a78b92c1287490eb6789e58e3bbd522.png?resizew=589)
(1)当AC=BC时,如图2,
①线段AD与BE的数量关系是 ;
②线段AD、BD、DE的数量关系是 .
(2)当AC=nBC时(n>0),如图3,
①判断线段AD与BE的数量关系,并予以证明;
②直接写出线段AD、BD、DE的数量关系 .
![](https://img.xkw.com/dksih/QBM/2020/10/9/2567321038938112/2567763640303616/STEM/4a78b92c1287490eb6789e58e3bbd522.png?resizew=589)
(1)当AC=BC时,如图2,
①线段AD与BE的数量关系是 ;
②线段AD、BD、DE的数量关系是 .
(2)当AC=nBC时(n>0),如图3,
①判断线段AD与BE的数量关系,并予以证明;
②直接写出线段AD、BD、DE的数量关系 .
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