2022年中考数学试卷分类汇编解析锐角三角函数与特殊角 .pdf
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1、锐角三角函数与特殊角一、选择题1.(2016四川达州3 分)如图,半径为3 的 A 经过原点O 和点 C(0,2),B 是 y 轴左侧 A 优弧上一点,则tanOBC 为()A B2CD【考点】圆周角定理;锐角三角函数的定义【分析】作直径CD,根据勾股定理求出OD,根据正切的定义求出tanCDO,根据圆周角定理得到 OBC=CDO,等量代换即可【解答】解:作直径CD,在 RtOCD 中,CD=6,OC=2,则 OD=4,tanCDO=,由圆周角定理得,OBC=CDO,则 tanOBC=,故选:C2.(2016四川乐山 3 分)如图3,在Rt ABC中,90BAC,ADBC于点D,则下列结论不正
2、确的是()A sinADBAB()BsinACBBC()CsinADBAC()DsinCDBAC答案:C 解析:考查正弦函数的概念。由正弦函数的定义,知:A、B正确,又 CAD B,所以,sinsinCDBCADAC,D也正确,故不正确的是C。3.(2016 广东,8,3 分)如图,在平面直角坐标系中,点A 坐标为(4,3),那么 cos的值是()A、34B、43C、35D、45答案:D 考点:三角函数,勾股定理。解析:过点A 作 AB垂直 x 轴与 B,则 AB3,OB4,由勾股定理,得OA5,所以,4cos5OBOA,选 D。4.(2016 年浙江省衢州市)如图,AB 是 O 的直径,C
3、是 O 上的点,过点C 作 O 的切线交 AB 的延长线于点E,若 A=30 ,则 sinE 的值为()A BCD【考点】切线的性质【分析】首先连接OC,由 CE 是 O 切线,可证得 OCCE,又由圆周角定理,求得 BOC的度数,继而求得E 的度数,然后由特殊角的三角函数值,求得答案【解答】解:连接OC,CE 是 O 切线,OCCE,A=30,BOC=2A=60 ,E=90 BOC=30 ,sinE=sin30=故选 AoxyA文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M
4、6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:
5、CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O
6、3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10
7、 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2
8、I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7
9、 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3
10、Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M65(2016山东烟台)如图,是我们数学课本上采用的科学计算器面板,利用该型号计算器计算cos55,按键顺序正确的是()ABCD【考点】计算器三角函数;计算器数的开方【分析】简单的电子计算器工作顺序是先输入者先算,其中RCM 表示存储、读出键,M+为存储加键,M为存储减键,根据按键顺序写出式子,再根据开方运算即可求出显示的结果【解答】
11、解:利用该型号计算器计算cos55,按键顺序正确的是故选:C6(2016山东烟台)如图,O 的半径为1,AD,BC 是 O 的两条互相垂直的直径,点P从点 O 出发(P点与 O 点不重合),沿 OCD 的路线运动,设AP=x,sinAPB=y,那么 y 与 x 之间的关系图象大致是()文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 Z
12、E3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3
13、S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文
14、档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ
15、7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E
16、6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 H
17、R7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9
18、N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6ABCD【考点】动点问题的函数图象【分析】根据题意确定出y 与 x 的关系式,即可确定出图象【解答】解:根据题意得:sin APB=,OA=1,AP=x,sinAPB=y,xy=1,即 y=(1 x2),图象为:,故选 B7(2016?辽宁沈阳)如图,在RtABC 中,C=90,B=30,AB=8,则 BC 的长是()AB4 C8D4【考点】解直角三角形【分析】根据cosB=及特殊角的三角函数值解题即可【解答】解:在RtABC 中,C=90 ,B=30 ,AB=8,cosB=,
19、即 cos30=,文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S1
20、0M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编
21、码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W
22、6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F
23、10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7
24、Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4
25、I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6文档编码:CZ7W6O3E6F10 HR7Y2I9N4I7 ZE3B3Y3S10M6BC=8=4;故选:D8.(2016 兰州,4,4 分)在 Rt ABC中,C90,sinA35,BC 6,则AB()。(A)4(B)6(C)8(D)
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