16.△ABC的两边长分别为2和2$\sqrt{3}$,第三边上的高等于$\sqrt{3}$,则△ABC的面积是( )
| A. | $\sqrt{3}$ | B. | 2$\sqrt{3}$ | C. | $\sqrt{3}$或2$\sqrt{3}$ | D. | 不能确定 |
15.
如图,四边形ABCD和四边形CEFG都是正方形,点D在CG边上,AB=4,EF=8,连接BD并延长交EC于点T,交FG于点P,则GT的长为( )
| A. | 2 | B. | $\sqrt{2}$ | C. | 2$\sqrt{2}$ | D. | 1 |
13.
如图,点F是正方形ABCD边CD上的一个动点,BF的垂直平分线EM与对角线AC相交于点E,与BF相交于点M,连接BE、FE,EM=3,则△EBF的周长是( )
| A. | 6+3$\sqrt{2}$ | B. | 6+6$\sqrt{2}$ | C. | 6-3$\sqrt{2}$ | D. | 3+3$\sqrt{2}$ |
11.
将一直角三角尺与两边平行的纸条按如图所示放置,下列结论中不一定成立的是( )
| A. | ∠1=∠2 | B. | ∠2=∠4 | C. | ∠2+∠4=90° | D. | ∠4+∠5=180° |
9.
如图,△ABC中,∠ABC=63°,点D,E分别是△ABC的边BC,AC上的点,且AB=AD=DE=EC,则∠C的度数是( )
0 286649 286657 286663 286667 286673 286675 286679 286685 286687 286693 286699 286703 286705 286709 286715 286717 286723 286727 286729 286733 286735 286739 286741 286743 286744 286745 286747 286748 286749 286751 286753 286757 286759 286763 286765 286769 286775 286777 286783 286787 286789 286793 286799 286805 286807 286813 286817 286819 286825 286829 286835 286843 366461
| A. | 21° | B. | 19° | C. | 18° | D. | 17° |