10.
如图,在?ABCD中,AB>AD,按以下步骤作图:以点A为圆心,小于AD的长为半径画弧,分别交AB、AD于点E、F;再分别以点E、F为圆心,大于$\frac{1}{2}$EF的长为半径画弧,两弧交于点G;作射线AG交CD于点H,则下列结论中不能由条件推理得出的是( )
| A. | AG平分∠DAB | B. | AD=DH | C. | DH=BC | D. | CH=DH |
9.一组数据2,x,4,3,3的平均数是3,则这组数据的中位数、众数、方差分别是( )
| A. | 3,3,0.4 | B. | 2,3,2 | C. | 3,2,0.4 | D. | 3,3,2 |
8.
如图,AD是∠EAC的平分线,AD∥BC,∠B=30°,则∠C的度数为( )
| A. | 50° | B. | 40° | C. | 30° | D. | 20° |
2.
如图所示,AB∥CD,EF⊥BD,垂足为E,∠1=50°,则∠2的度数为( )
0 284014 284022 284028 284032 284038 284040 284044 284050 284052 284058 284064 284068 284070 284074 284080 284082 284088 284092 284094 284098 284100 284104 284106 284108 284109 284110 284112 284113 284114 284116 284118 284122 284124 284128 284130 284134 284140 284142 284148 284152 284154 284158 284164 284170 284172 284178 284182 284184 284190 284194 284200 284208 366461
| A. | 50° | B. | 40° | C. | 45° | D. | 25° |