1 . 如图,一个钟摆的摆长
为1.5米,当钟摆向两边摆动时,摆角
为
,且两边的摆动角度相同,则它摆至最高位置与其摆至最低位置时的高度之差
为 ___________________ .(用含
的式子表示)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d62e8aadaadebf1454fde21a390ebdea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bf3119c19f5145624d22c24761b9c30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da971671378e8d40e15f5ef0b6e41467.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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2 . 如图,
是
的直径,过点
作
的切线
,连接
,交
于点D,过点
作
的平行线,交
于点
,连接
.
是
的切线;
(2)若
,
,求AD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/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.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/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cb6362bc99fba4bcd7331db9aee922c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1d2231c7a2875ab6d423dff3ead4069.png)
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3 . 如图,在
中,
,定义:斜边与
的对边的比叫做
的余割,用“
”表示.若该直角三角形的三边分别为a,b,c,则
,那么下列说法正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ccdccf6ca4ab39cc41fe3f7afc2846d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ccdccf6ca4ab39cc41fe3f7afc2846d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfb9906b2d827ade57191be30cb2502c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5de4fe2b8eed657105fe1337ec156de8.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
4 . 如图,已知正方形
,将正方形
绕点A旋转
得到正方形
,其中点E与点B对应,点F与点C对应,点G与点D对应,若直线
交直线
于点O,
,则
的长是__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8d0e8404f347a0eb4c76f4d25d9bdac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecff6005f926665a926c07ad62e0f032.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/26/5f8fa908-7cc8-49c4-8763-7b4a6d9d62d7.png?resizew=116)
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2024九年级下·浙江·专题练习
5 . 如图,已知
,
是斜边
边上的高,那么下列结论正确的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/12/5ec92b61-7602-4b50-be16-d7bc5e2871e0.png?resizew=141)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/12/5ec92b61-7602-4b50-be16-d7bc5e2871e0.png?resizew=141)
A. ![]() | B. ![]() |
C. ![]() | D. ![]() |
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2024九年级下·全国·专题练习
6 . 如图,在
中,
,定义:斜边与
的对边的比叫做
的余割,用“
”表示.如设该直角三角形的三边分别为a,b,c,则
,那么下列说法正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70cf462d79ca447d57b92166706f1879.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5de4fe2b8eed657105fe1337ec156de8.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
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7 . 如图,小明同学测量一个光盘的直径,他只有一把直尺和一块三角板,他将直尺、光盘和三角板如图放置于桌面上,并量出
cm,则此光盘的直径是( )cm
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/2/3b3f6638-eda8-4381-b5cd-fa6ebfca4c42.jpg?resizew=164)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/757185f4ef76c7af657c842bf7807282.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/2/3b3f6638-eda8-4381-b5cd-fa6ebfca4c42.jpg?resizew=164)
A.7 | B.![]() | C.7![]() | D.1 |
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8 . 在
中,
的对边分别为
,下列结论中,能成立的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ce7f6d278f2ef7a193b7eed7be6b3c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1975fdcb4e81f8fa1bb9435325fa00f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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9 . 在
中,
,
,
,则
的面积等于( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f08273d339dc5ddbb89aa67bb8205e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07160f14b3b453bebb64cb2bf96dc85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38881f99bb64a574dd49a729e409581e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
A.12 | B.30 | C.37.5 | D.24 |
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10 . 如图,在
中,
是斜边
上的高,则下列正确的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/28/d94dc9d5-6e20-4c7c-88da-3fec146f39a0.png?resizew=129)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/28/d94dc9d5-6e20-4c7c-88da-3fec146f39a0.png?resizew=129)
A.![]() | B.![]() |
C.![]() | D.![]() |
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