19-20高一·全国·课后作业
1 . 半径为
的圆内接三角形的面积为
,求此三角形三边长的乘积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a09b5f459f48a235b5152eab56aeaecd.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/25/342f3eb6-e92a-4eab-af48-efe993180df8.png?resizew=142)
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2012·山东菏泽·一模
2 . 在△ABC中,角A、B、C的对边分别为a、b、c,向量
=(sinA,b+c),
=(a-c,sinC-sinB),满足
=
(Ⅰ)求角B的大小;(Ⅱ)设
=(sin(C+
),
),
=(2k,cos2A) (k>1),
有最大值为3,求k的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eac8f5a61981d71bc8f86cfed42a71ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05994f52efc4f4976cbfda2d5c8016bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13038bb8599a07b70dc7bfa7357d32c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/866551aa60c346b78f726d360e724a9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/750402eef953e16a0bbfb7d471562aaa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecdab625e32e38d1c72c901cece0e147.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/074052868068e1d6119a01685888aff8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/224f42c7e7224bda4cb29b8ecfb799cb.png)
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3 . 已知圆的内接四边形ABCD的边长分别为AB=2,BC=6, CD=DA=4,
(1)求角A的大小;
(2)求四边形ABCD的面积.
(1)求角A的大小;
(2)求四边形ABCD的面积.
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4 . 如图,在
中,
,
,
,点
在线段
上,且
.
![](https://img.xkw.com/dksih/QBM/2015/4/29/1572085123153920/1572085129109504/STEM/3e4eef6df8384847b9a4c938fa03e35d.png)
(Ⅰ)求
的长;
(Ⅱ)求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd936a2405709574af0a73543d94ad9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0afeac40dcde1888c35758b4581a865.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f8eeeea1c9652cacce976f8129cf520.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/6b16bdd93abe90e02f0d7da8bfb4894b.png)
![](https://img.xkw.com/dksih/QBM/2015/4/29/1572085123153920/1572085129109504/STEM/3e4eef6df8384847b9a4c938fa03e35d.png)
(Ⅰ)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
(Ⅱ)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d48a7bb8310692ed00f2faa235a1890.png)
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5 . 在
中,角
,
,
的对边分别为
,
,
,
,求
的值
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45eebab82cc45e4d72b3027af4eaa3ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/194741f4d2ae7ee44cafca780361446a.png)
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