如图,在
中,
.将线段
绕点A逆时针旋转90°得到线段
,E是边
上的一动点,连接
交
于点F,连接
.
![](https://img.xkw.com/dksih/QBM/2020/12/15/2614711885586432/2614780899155968/STEM/10b8e0e9a4c8408daa4bb6549a6d8d7d.png?resizew=138)
(1)求证:
;
(2)点H在边
上(不含端点),且
,连接
交
于点N.请在答卷上将图形补充完整 并解答:
①判断
与
的位置关系,并证明你的结论;
②若
和
的面积分别为a和b,求四边形
的面积(用含a和b的代数式表示).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a67c2be5a9976ec9985f93bbb92fef13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://img.xkw.com/dksih/QBM/2020/12/15/2614711885586432/2614780899155968/STEM/10b8e0e9a4c8408daa4bb6549a6d8d7d.png?resizew=138)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bce9fd745dfcffdb32c76c2b47ed20d9.png)
(2)点H在边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/565dbfc5ed64efb04fabfa77ebc4e957.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826c728050e3378921442ace20269ef6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
①判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826c728050e3378921442ace20269ef6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f7ad41b36674fd6e90176ee24cdefbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ff39c7aa648afd1080206c8080ff79e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bb5102d2c6f82e32066b2c27372c248.png)
2019·浙江杭州·模拟预测 查看更多[1]
(已下线)【新东方】 初中数学953【2019年】【初三下】
更新时间:2020-12-15 16:48:16
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相似题推荐
解答题-问答题
|
适中
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【推荐1】综合与实践
数学活动课上,同学们开展了以折叠为主题的探究活动,如图①,已知矩形纸片
,其中
,
.
将矩形纸片
按图①折叠,使点B落在
边上的点
处,请判断四边形
的形状,并说明理由;
(2)探究发现
将图①的纸片展平,把四边形
剪下来,如图②,取
边的中点
,将
沿
折叠得到
,延长
交CD于点N.
①求
的长;
②直接写出
的周长.
数学活动课上,同学们开展了以折叠为主题的探究活动,如图①,已知矩形纸片
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc89dbda86a8c05e4fb4aa46c642b303.png)
将矩形纸片
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bedde879f99aed69d745d5ec8fe62084.png)
(2)探究发现
将图①的纸片展平,把四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e41c2d7ae6aaf6d91129ed5221a415a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/735056c174e8dd7906257a2a50a962a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f68d65ed39a9dfd09c5b907b5de6b144.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b46c607b3deac746c0ef3389ad8f65c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73c8f5ba45ee757675b708a3b9bc3c2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3184cd468586362043f15d3964991725.png)
①求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b46c607b3deac746c0ef3389ad8f65c.png)
②直接写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97c0e1c17a2c9feaa4bd0639ffaa19f9.png)
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解答题-作图题
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名校
【推荐2】如图,已知四边形ABCD中,AB=24,AD=15,BC=20,CD=7,∠ADB+∠CBD=90°.
(1)在BD的上方作△A'BD,使△A'BD≌△ADB(点A与点
不重合)(不写作法,保留作图痕迹);
(2)求四边形ABCD的面积.
(1)在BD的上方作△A'BD,使△A'BD≌△ADB(点A与点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2d7ffb7889a31b267a85f1ea238138e.png)
(2)求四边形ABCD的面积.
![](https://img.xkw.com/dksih/QBM/2021/1/8/2631803499782144/2635374640644096/STEM/eff9e9b3b62349d8985122ce66b9971f.png?resizew=192)
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解答题-作图题
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适中
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【推荐1】如图,是由边长为1的小正方形构成
的网格,每个小正方形的顶点叫格点,A、B、D是格点,E是
与网格线的交点,仅用无刻度直尺在给定的网格中画图,画图过程用虚线,画图结果用实线表示.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/6/f8e29a34-d3d5-4e26-a50a-0111111d471e.png?resizew=400)
(1)直接写出图中
的长=________.
(2)在图①中画出等腰
,使
.
(3)在图②中先平移线段
至
(A对应D,B对应C),再在线段
上画一点H,使得
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd4be97adde17423d59d86d18318c2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/6/f8e29a34-d3d5-4e26-a50a-0111111d471e.png?resizew=400)
(1)直接写出图中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
(2)在图①中画出等腰
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/962971dff06336b03d1f93814550b7da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/451ea6de58f173e38a639e59bc756af5.png)
(3)在图②中先平移线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a328c8a4ae95aeefae84b52f82a91016.png)
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【推荐2】(1)如图(a)所示,点
是正方形
内的一点,把
绕点
顺时针方向旋转,使点
与点
重合,点
的对应点是
.若
,
,
,求
的度数.
(2)如图(b)所示,点
是等边三角形
内的一点,若
,
,
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a855335176fc36a15017f50a8561348.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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/491c3a4f72b84ebadd28b90711435adc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3755b2bcf7516eedb26a27ad73657216.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a43c2d5aae759fc4db16115c8188ceec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d562b8113bda32f4b05b465836fe8c.png)
(2)如图(b)所示,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68e4c8ad524facc6aa1bd24f8f422260.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91ce0586aafd9bf4fb7e1be082624afc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/367010f36499b601e5ffb0dae76fbe18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93b1d3ba8a6c2acb3540714e99481f8e.png)
![](https://img.xkw.com/dksih/QBM/2020/3/4/2412279460028416/2412501090967552/STEM/f615e355-7000-4f06-85d6-944f39e57913.png)
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