如图,已知:
.
内部,且
,
(2)判断
的形状.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99a33aee85aa8cde1a399dd4cf0808bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5981404ee62758713e98481d836d988.png)
(2)判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c025ee3317be1099b7bf03a11e37ed4.png)
更新时间:2024-05-23 11:29:44
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相似题推荐
解答题-作图题
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【推荐1】如图,
为锐角三角形,在
所在直线的右上方找一点D,使
,且
.(用无刻度的直尺和圆规作图,不写作法,保留作图痕迹).
![](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/236c134aad7d9a21c49c07e924b9a531.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d069ebe5f7d0ab61763a0112af2189e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/28/1094e3fb-7503-43cb-af84-9bba3b8f98df.png?resizew=183)
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解答题-问答题
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【推荐2】如图,四边形
是平行四边形.
的平分线
,交
于点
,交
延长线于点
(不写作法,保留作图痕迹);
(2)若
为
的中点,求证:
;
(3)在(2)的条件下,若
,求四边形
的周长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2947ca8e0cdbeb4aab80ce9e7b63ba98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d258f65ba8d0a71c52cdf8c5302ecd2.png)
(3)在(2)的条件下,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93bc4c9dd737193f7acce692b23500d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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解答题-作图题
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适中
(0.65)
【推荐1】如图,在
中,
.
的垂直平分线,交
于点D,交
于点E;
(2)延长
到F,使
,连接
,求证:四边形
是平行四边形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e01009f2f3a3476fd1efe90291083132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b312dab930cbbb9a4bb1a99f044dab73.png)
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解答题-证明题
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【推荐2】如图,在四边形ABCD中,∠BAD=∠BCD=90°,AC、BD相交于点E,点G、H分别是AC、BD的中点.
(1)求证:HG⊥AC;
(2)当AC=8cm,BD=10cm时,求GH的长.
(1)求证:HG⊥AC;
(2)当AC=8cm,BD=10cm时,求GH的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/6/16/6762033a-2089-43a2-b313-fd996d22c95b.png?resizew=188)
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解答题-作图题
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【推荐1】如图,已知
,利用尺规作图法求作
边的中线
.(不写作法,保留作图痕迹)
![](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/d40b319212a7e7528b053e1c7097e966.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/20/e9a90e42-d7e6-4683-b2bc-3fa7e6246f5e.png?resizew=172)
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解答题-作图题
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【推荐2】如图,在矩形ABCD中,
,AC为对角线.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/15/484891ea-1a5a-44e0-925e-d0d80749b102.png?resizew=181)
(1)尺规作图:作线段AC的垂直平分线,分别交AD、BC于E点和F点,交AC于O点;(保留作图痕迹,不写作法)
(2)在(1)所作图形中,连结AF,CE,求证:四边形AFCE为菱形,请完成下列证明过程.
证明:∵在矩形ABCD中,
,∴
______,
又∵EF垂直平分AC,∴![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b2fb91028cda3644b82b04da29cbe52.png)
在
与
中,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d7921f25bac8995a850d65655be09ae.png)
∴
,∴
______
又∵
,∴四边形AFCE为______,
又∵EF垂直平分AC,∴
______,∴平行四边形AFCE为菱形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3039c774e00f6520449aa9d4b3c45464.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/15/484891ea-1a5a-44e0-925e-d0d80749b102.png?resizew=181)
(1)尺规作图:作线段AC的垂直平分线,分别交AD、BC于E点和F点,交AC于O点;(保留作图痕迹,不写作法)
(2)在(1)所作图形中,连结AF,CE,求证:四边形AFCE为菱形,请完成下列证明过程.
证明:∵在矩形ABCD中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4adf90a8c2b29334cdc5aa5b554991f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/494ba20b1444f524cf636961e4688ae8.png)
又∵EF垂直平分AC,∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b2fb91028cda3644b82b04da29cbe52.png)
在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e34093c141bb2affefcc0d7c03a082e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/840afc01e2993e10f49277c0cc6ebb2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d7921f25bac8995a850d65655be09ae.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3f6b6f830fb86f91c3e42fd2d27afea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32217457c4e96e2ef155cf15c1b65d97.png)
又∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed619e2dc900c52a29012e5b821451bc.png)
又∵EF垂直平分AC,∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4dd9aa2b453b60ba3250ad5a315d1b5.png)
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解答题-问答题
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【推荐1】2019年12月27日,我国成功发射了“长征五号”遥三运载火箭.如图,“长征五号”运载火箭从地面
处垂直向上发射,当火箭到达
处时,从位于地面
处的雷达站测得此时仰角
,当火箭继续升空到达
处时,从位于地面
处的雷达站测得此时仰角
,已知
,
.
(1)求
的长;
(2)若“长征五号”运载火箭在
处进行“程序转弯”,且
,求雷达站
到其正上方点
的距离.
![](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/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1cb8fc1c1ff0b33616a96f25e7e79f50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c48ee460e89e8854001f872d404a52d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d260216d30c8c792491e52b56b865d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/240223a1d8f106e788d384b12ab6a0d3.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)若“长征五号”运载火箭在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/010d1f10cc200076a87970108a4ce8f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/18/51134c17-79e5-4154-81ce-172e5f86d819.png?resizew=206)
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【推荐2】一次数学课上,老师在黑板上画了一个图形,并写下了四个等式:①BD=CA,②AB=DC,③∠B=∠C,④∠BAE=∠CDE.要求同学从这四个等式中选出两个作为条件,推出AE=DE.请你试着完成老师提出的要求,并说明理由.(写出一种即可)
已知: (请填写序号),求证:AE=DE.
已知: (请填写序号),求证:AE=DE.
![](https://img.xkw.com/dksih/QBM/2020/12/7/2608936254914560/2613289376260096/STEM/f92baca89fb94debb36d62e185cc1c34.png?resizew=184)
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