满分5 >
初中数学试题 >
(2002•荆州)如图,Rt△ABC中,∠C=90°,D为BC上一点,∠DAC=...
(2002•荆州)如图,Rt△ABC中,∠C=90°,D为BC上一点,∠DAC=30°,BD=2,AB=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232602463421933/SYS201310212326024634219008_ST/0.png)
,则AC的长是( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232602463421933/SYS201310212326024634219008_ST/images1.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232602463421933/SYS201310212326024634219008_ST/1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232602463421933/SYS201310212326024634219008_ST/2.png)
C.3
D.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232602463421933/SYS201310212326024634219008_ST/3.png)
考点分析:
相关试题推荐
(2002•丽水)如图,在△ABC中,AB=3,AC=2,∠A=30°,则△ABC的面积等于( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232602463421933/SYS201310212326024634219007_ST/images0.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232602463421933/SYS201310212326024634219007_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232602463421933/SYS201310212326024634219007_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232602463421933/SYS201310212326024634219007_ST/2.png)
D.3
查看答案
(2002•四川)如图,在Rt△ABC中,∠ACB=90°,CD⊥AB于D,AC=2
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232602463421933/SYS201310212326024634219006_ST/0.png)
,AB=2
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232602463421933/SYS201310212326024634219006_ST/1.png)
,设∠BCD=α,那么cosα的值是( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232602463421933/SYS201310212326024634219006_ST/images2.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232602463421933/SYS201310212326024634219006_ST/2.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232602463421933/SYS201310212326024634219006_ST/3.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232602463421933/SYS201310212326024634219006_ST/4.png)
D.
查看答案
(2002•咸宁)如图,Rt△ABC中,∠ACB=90°,CD⊥AB于点D,BC=3,AC=4,设∠BCD=α,则tanα的值为( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232602463421933/SYS201310212326024634219005_ST/images0.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232602463421933/SYS201310212326024634219005_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232602463421933/SYS201310212326024634219005_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232602463421933/SYS201310212326024634219005_ST/2.png)
D.
查看答案
(2006•烟台)如图,在矩形ABCD中,DE⊥AC于E,设∠ADE=α,且cosα=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232602463421933/SYS201310212326024634219004_ST/0.png)
,AB=4,则AD的长为( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232602463421933/SYS201310212326024634219004_ST/images1.png)
A.3
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232602463421933/SYS201310212326024634219004_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232602463421933/SYS201310212326024634219004_ST/2.png)
D.
查看答案
(2002•朝阳区)用科学记算器算得①29
3=24389;②
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232602463421933/SYS201310212326024634219003_ST/0.png)
;③sin35°≈0.573576436;④若tana=5,则锐角a≈0.087488663°.其中正确的是( )
A.①②③
B.①②④
C.②③④
D.①③④
查看答案