1.
已知,如图长方形ABCD中,AB=6cm,AD=12cm,将此长方形折叠,使点B与点D重合,折痕为EF,则△ABE的面积为( )
| A. | $\frac{9}{2}$cm2 | B. | 6cm2 | C. | $\frac{27}{2}$cm2 | D. | 18cm2 |
18.
如图,在△ABC中,∠C=90°,∠B=30°,以A为圆心,小于AC为半径画弧,分别交AB、AC于点M和N,再分别以M、N为圆心,大于$\frac{1}{2}$MN的长为半径画弧,两弧交于点P,连接AP交BC于点,则下列说法不正确的是( )
0 297631 297639 297645 297649 297655 297657 297661 297667 297669 297675 297681 297685 297687 297691 297697 297699 297705 297709 297711 297715 297717 297721 297723 297725 297726 297727 297729 297730 297731 297733 297735 297739 297741 297745 297747 297751 297757 297759 297765 297769 297771 297775 297781 297787 297789 297795 297799 297801 297807 297811 297817 297825 366461
| A. | AD平分∠BAC | B. | S△DAC:S△ABC=1:2 | ||
| C. | 点D在线段AB的垂直平分线上 | D. | ∠ADC=60° |