如图,在
中,
,
于点D,
为
边上的中线.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/27/af430278-8494-4938-bdcb-771b552664b7.png?resizew=205)
(1)若
,求
的度数;
(2)若
,求点A到
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5f215a42c4b7078d8d65923eb9980e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/27/af430278-8494-4938-bdcb-771b552664b7.png?resizew=205)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b15d7d8b1b15a0dc79d6d482c1cf8889.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/194741f4d2ae7ee44cafca780361446a.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f244bc9a0c8fd98be9093604c0101515.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
2024九年级下·浙江·专题练习 查看更多[1]
(已下线)第02讲 解直角三角形(知识解读+真题演练+课后巩固)-2023-2024学年九年级数学下册《知识解读·题型专练》(浙教版)
更新时间:2024-03-27 21:16:57
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相似题推荐
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【推荐1】已知,如图,在矩形
中,
是对角线,
,点P从点A出发,沿
方向匀速运动,速度为
,同时,点Q从点B出发,沿
方向匀速运动,速度为
,过点P作
于点M,连接
,设运动时间为
,解答下列问题:
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/18/20c05623-5e37-4d35-82ce-0b3a6a11432d.png?resizew=153)
(1)当t为何值时,四边形
是矩形?
(2)是否存在某一时刻,使
,若存在,求出t的值,若不存在,请说明理由.
(3)当t为何值时,点
在一条直线上
![](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/fab1ba63de8a1f228099cce2586cf7ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5631e6ec24d3d67bf4592313b6b3f4f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5631e6ec24d3d67bf4592313b6b3f4f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a40b744f59a78172b82d3ea6a3216103.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dde29486c27bf2905ced2fc8308e80a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/18/20c05623-5e37-4d35-82ce-0b3a6a11432d.png?resizew=153)
(1)当t为何值时,四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a6b6b990538d6654ce4775f26b57b8b.png)
(2)是否存在某一时刻,使
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16d0b6d3f0ee625bc6160082bd2abee2.png)
(3)当t为何值时,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3843432ca206512bc581ab65f14b78f2.png)
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【推荐2】手工课上,小明准备做一个形状是菱形的风筝,这个菱形的两条对角线长度之和恰好为
,菱形的面积
(单位:
)随其中一条对角线的长
(单位:
)的变化而变化.
(1)请直接写出
与
之间的函数关系式(不要求写出自变量
的取值范围);
(2)当菱形风筝面积为
时,求菱形风筝的边长是多少?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3d8789e1f6656c346853f226c08863e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88ce13774b09ff2edddaf21a072cf60a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efa9fbcfb9595e2f031aa691db4564b.png)
(1)请直接写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)当菱形风筝面积为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86e3c423b144dc231199f265e6a138e8.png)
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【推荐1】如图,在ΔABC中,∠ABC=90º,D为AC的中点,过点C作CE⊥BD于点E,过点A作BD的平行线,交CE的延长线于点F,在AF的延长线上截取FG=BD,连接BG、DF
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/15/22f12665-4e24-41ff-bf53-388516da9535.png?resizew=235)
(1)猜想四边形BDFG的形状,并说明理由
(2)若AF=8,CF=6,求四边形BDFG的周长
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/15/22f12665-4e24-41ff-bf53-388516da9535.png?resizew=235)
(1)猜想四边形BDFG的形状,并说明理由
(2)若AF=8,CF=6,求四边形BDFG的周长
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【推荐2】如图,在四边形ABCD中,∠ABC=90°,AC=AD,M,N分别是AC,CD的中点,连接BM,MN,BN.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/15/7d8eb948-8daa-4fb5-9309-1016ed25f338.png?resizew=152)
(1)求证:BM=MN;
(2)若∠BAD=60°,AC平分∠BAD,AC=2.
①求∠BMN的度数;
②求BN的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/15/7d8eb948-8daa-4fb5-9309-1016ed25f338.png?resizew=152)
(1)求证:BM=MN;
(2)若∠BAD=60°,AC平分∠BAD,AC=2.
①求∠BMN的度数;
②求BN的长.
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【推荐1】已知:如图,平行四边形
中,点M、N分别在边
、
上,对角线
分别交
、
于点E、F,且
.
(1)求证:
;
(2)设
,
,请直接写出
和
关于
、
的分解式:
;
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f50b3ae183997b707d16eb4e7f6712fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d400ad70796c12391be6056608213c47.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/6/65adff0d-a7a5-4e1f-887d-32da7e5f27a7.png?resizew=170)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80889017a15f406e901e1db5bf556463.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5510f2990d22053f8dc2e3cf3c65772.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7506249375fa7e8a21c6aabe27d190ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a014dff8997c661055229de29c61cfc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4781e3daa2c4e018ca0ae09bb56abc0f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64c5562bd4d1b54424330cb6329cd79d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b45ba716f03748c19b7ce2f99af536ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8926ddd0b69d714c7310cc5bf23d199d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ec33b8270e7493da5408ddc3e9848e2.png)
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【推荐2】如图,在等腰直角三角形
中,
,
,边长为2的正方形
的对角线交点与点C重合,点D在
ABC内部,
与
交于点M,连接
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/27/ea06788e-8dfd-47e8-a3fa-2e3fe6d1c6eb.png?resizew=182)
(1)求证:
;
(2)当
时,求
的长;
(3)当点A、D、E三点在同一直线上时,直接写出
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c9f93c7e7f4b9244cc5c6cc4dece9d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2257da1e2425f2ea9ac7440f52659ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/27/ea06788e-8dfd-47e8-a3fa-2e3fe6d1c6eb.png?resizew=182)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25909c6d42ce09a8f3847075596118db.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4795ee1f96b430529934e2231b38885d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
(3)当点A、D、E三点在同一直线上时,直接写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
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【推荐3】【操作发现】
(1)如图1,在边长为1个单位长度的小正方形组成的网格中,△ABC的三个顶点均在格点上.请按要求画图:将ABC绕点A顺时针方向旋转90°,点B的对应点为B′,点C的对应点为C′,连接BB′,此时∠ABB′等于多少度;
![](https://img.xkw.com/dksih/QBM/2019/10/7/2306722018639872/2307049471041536/STEM/32f9900f2b21496b882e25e38577f738.png?resizew=474)
【问题解决】
在某次数学兴趣小组活动中,小明同学遇到了如下问题:
(2)如图2,在等边△ABC中,点P在内部,且PA=3,PC=4,∠APC=150°,求PB的长.
经过同学们的观察、分析、思考、交流、对上述问题形成了如下想法:将△APC绕点A按顺时针方向旋转60°,得到△ABP’,连接PP′,寻找PA、PB、PC三边之间的数量关系……请参考他们的想法,完成该问题的解答过程;
【学以致用】
(3)如图3,在等边△ABC中,AC=7,点P在△ABC内,且∠APC=90°,∠BPC=120°.求△APC的面积;
【思维拓展】
如图4,在四边形ABCD中,AE⊥BC,垂足为E,∠BAE=∠ADC,BE=CE=1,CD=3,AD=kAB(k为常数),请直接写出BD的长(用含k的式子表示).
(1)如图1,在边长为1个单位长度的小正方形组成的网格中,△ABC的三个顶点均在格点上.请按要求画图:将ABC绕点A顺时针方向旋转90°,点B的对应点为B′,点C的对应点为C′,连接BB′,此时∠ABB′等于多少度;
![](https://img.xkw.com/dksih/QBM/2019/10/7/2306722018639872/2307049471041536/STEM/32f9900f2b21496b882e25e38577f738.png?resizew=474)
【问题解决】
在某次数学兴趣小组活动中,小明同学遇到了如下问题:
(2)如图2,在等边△ABC中,点P在内部,且PA=3,PC=4,∠APC=150°,求PB的长.
经过同学们的观察、分析、思考、交流、对上述问题形成了如下想法:将△APC绕点A按顺时针方向旋转60°,得到△ABP’,连接PP′,寻找PA、PB、PC三边之间的数量关系……请参考他们的想法,完成该问题的解答过程;
【学以致用】
(3)如图3,在等边△ABC中,AC=7,点P在△ABC内,且∠APC=90°,∠BPC=120°.求△APC的面积;
【思维拓展】
如图4,在四边形ABCD中,AE⊥BC,垂足为E,∠BAE=∠ADC,BE=CE=1,CD=3,AD=kAB(k为常数),请直接写出BD的长(用含k的式子表示).
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【推荐1】在一次数学研究性学习中,小明将如图1中的两个全等的直角三角形纸片ABC和DEF拼在一起,其中
,
,
,并进行如下研究活动.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/8/051eaac5-8f70-4a91-be2c-a8342cbaf98d.png?resizew=422)
(1)活动一:将两个全等的直角三角形纸片拼成如图2的等腰三角形,点M在AD上,点N在BD上,且
,若
,则
______;
(2)活动二:将两个全等的直角三角形纸片拼成如图3的平行四边形,将图3中的纸片ABC沿CA方向平移,连接AE,BD,如图4,易证四边形ABDE是平行四边形,继续将纸片ABC沿CA方向平移到某一位置,小明发现四边形ABDE是矩形如图5,求AF的长;
(3)活动三:将两个全等的直角三角形纸片拼成如图6的矩形,分别取AF、AB的中点P、F,连接PF,将
绕点A逆时针方向旋转,得到
,连接
,
,设旋转角为
(
),
能否为直角三角形?若能,试求出此时
,若不能,请说明理由.
(4)在图8中,取AF的中点M,点N是AC的动点,连接MN,将
沿MN翻折得到
,连接
,则
的最小值为______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a569bb4a99615a33360e5f352bff2fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1cc4dbe95b6b71e9e86915b50a302a54.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b3d925542f0db9d1aa496109047b7cc.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/8/051eaac5-8f70-4a91-be2c-a8342cbaf98d.png?resizew=422)
(1)活动一:将两个全等的直角三角形纸片拼成如图2的等腰三角形,点M在AD上,点N在BD上,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68196fa1014a4e2c2bdb00601982ca4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/810fee760e06028fb7d37e65db79bfa7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6243490cdfc0747c0cba492bd78a0758.png)
(2)活动二:将两个全等的直角三角形纸片拼成如图3的平行四边形,将图3中的纸片ABC沿CA方向平移,连接AE,BD,如图4,易证四边形ABDE是平行四边形,继续将纸片ABC沿CA方向平移到某一位置,小明发现四边形ABDE是矩形如图5,求AF的长;
(3)活动三:将两个全等的直角三角形纸片拼成如图6的矩形,分别取AF、AB的中点P、F,连接PF,将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ceff3844281849df3e37a2e56e110549.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2599e431b192d122ad88c439f9096ce6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdc07d6900fdd734056b4380842b251c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acbad65b3d744b70da2480eee1cdb587.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94d6402e3d060dcdeff009dd8258be92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29bf0cf2f9b056030f17dfba06f62b1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d081711ee5af0efa35636c337ac0439a.png)
(4)在图8中,取AF的中点M,点N是AC的动点,连接MN,将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98013a5042685a1db94249e70c62c09a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e3bacc06686947aeaf85e71b2e46aaa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e26d9636ad77369535852c6e4493446a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e26d9636ad77369535852c6e4493446a.png)
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【推荐2】如图,一次函数
的图像与x轴交于点
,与反比例函数
的图像交于点
,过直线
上的点B作
轴于点C,与反比例函数交于点
,连接
,
.
(2)求
;
(3)若点P是直线
上的动点,是否存在点P,使得
与
相似?若存在,求出此时P点的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87490be8d0cdb7bc6c39d1a37f3bc335.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/913f78382630e50543e5f7192cae3ed3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9212e728b36c078188606c9d429389d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45feec93c1838e77a301067be49f0f57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05b45db8dd8768994af51206565379fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43f4311fdf02073ec7bf3f0d4e6a3374.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d30b4015828f35d27adf7c12be8887a4.png)
(3)若点P是直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/357265c532428e886a643e8e653eec9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c15514bc735fe4b744672edefe00009c.png)
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