已知在
中,
分别为
所对的边,由下列条件解直角三角形.
(1)已知
,求
.
(2)已知
,
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d0cc0ed51a452e2abdf9eec46ee34c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8551fd9f84d6873051bde12ecb791596.png)
(1)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a428a82f5a1e59c87dc0e4d4388b16cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/742ead6fec3424540a6fb14950582918.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5b8b98b2f83279a49e94d9f48c5e6f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
更新时间:2024-03-08 06:27:20
|
【知识点】 解直角三角形的相关计算解读
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解答题-证明题
|
较易
(0.85)
【推荐1】如图,在
中,点
为
的中点,连接
,以
为直径作
,
交
于点
,
为
的切线.
(1)求证:
;
(2)若
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](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/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/25/a32a349a-1813-442b-a4ba-03b852daf285.png?resizew=178)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1b2ccdef4fc69a203ef1f688923a4e4.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4494a85de0be0b97a69348115aef8513.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/905f306dc08525842a96cfcab32c1ce8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
您最近一年使用:0次
解答题-证明题
|
较易
(0.85)
【推荐2】如图,△ABC内接于⊙O,弦AD⊥AB, 交BC于点E,过点B作⊙O的切线交DA的延长线于点F,且∠ABF=∠ABC.
(1)求证:AB=AC
(2)若AD=4,cos∠ABF =
,求BF的长.
(1)求证:AB=AC
(2)若AD=4,cos∠ABF =
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7294f5ae2a24ff42e84cd9773b2a7287.png)
![](https://img.xkw.com/dksih/QBM/2020/6/25/2492412877307904/2493702574874624/STEM/8859b3eb1a6641b5925e7ffbea592137.png?resizew=186)
您最近一年使用:0次