满分5 >
初中数学试题 >
(2001•吉林)如图,菱形ABCD的对角线AC=6,BD=8,∠ABD=α,则...
(2001•吉林)如图,菱形ABCD的对角线AC=6,BD=8,∠ABD=α,则下列结论正确的是( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232654576213901/SYS201310212326545762139004_ST/images0.png)
A.sinα=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232654576213901/SYS201310212326545762139004_ST/0.png)
B.cosα=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232654576213901/SYS201310212326545762139004_ST/1.png)
C.tanα=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232654576213901/SYS201310212326545762139004_ST/2.png)
D.tanα=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232654576213901/SYS201310212326545762139004_ST/3.png)
考点分析:
相关试题推荐
(2001•温州)在Rt△ABC中,∠C=90°,BC=4,AC=3,则tanA的值是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232654576213901/SYS201310212326545762139003_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232654576213901/SYS201310212326545762139003_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232654576213901/SYS201310212326545762139003_ST/2.png)
D.
查看答案
(2001•宁波)如图,矩形纸片ABCD沿DF折叠后,点C落在AB上的E点.DE、DF三等分∠ADC,AB的长为6,则梯形ABFD的中位线长为( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232654576213901/SYS201310212326545762139002_ST/images0.png)
A.不能确定
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232654576213901/SYS201310212326545762139002_ST/0.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232654576213901/SYS201310212326545762139002_ST/1.png)
D.
查看答案
(2001•河北)已知等腰三角形三边的长为a、b、c,且a=c.若关于x的一元二次方程
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232654576213901/SYS201310212326545762139001_ST/0.png)
的两根之差为
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232654576213901/SYS201310212326545762139001_ST/1.png)
,则等腰三角形的一个底角是( )
A.15°
B.30°
C.45°
D.60°
查看答案
(2001•黑龙江)已a、b、c分别为△ABC中∠A、∠B、∠C的对边,若关于x的方程(b+c)x
2-2ax+c-b=0有两个相等的实根且sinB•cosA-cosB•sinA=0,则△ABC的形状为( )
A.直角三角形
B.等腰三角形
C.等边三角形
D.等腰直角三角形
查看答案
(2001•吉林)如图,A、B是直线l上的两点,AB=4厘米,过l外一点C作CD∥l,射线BC与l所成的锐角∠1=60°,线段BC=2厘米,动点P、Q分别从B、C同时出发,P以每秒1厘米的速度沿由B向C的方向运动,Q以每秒2厘米的速度沿由C向D的方向运动.设P,Q运动的时间为t(秒),当t>2时,PA交CD于E.
(1)求△APQ的面积S与t的函数关系式;
(2)QE恰好平分△APQ的面积时,试求QE的长是多少厘米?
查看答案