6.
如图,在等边△ABC中,AB=2$\sqrt{2}$,以点A为圆心,AB为半径画$\widehat{BD}$,使得∠BAD=105°,过点C作CE⊥AD,则图中阴影部分的面积为( )
| A. | π-2 | B. | π-1 | C. | 2π-2 | D. | 2π+1 |
5.
如图,线段BC的两端点的坐标分别为B(3,7),C(6,3),以点A(1,0)为位似中心,将线段BC缩小为原来的$\frac{1}{2}$后得到线段DE,则端点D的坐标为( )
| A. | (1,$\frac{7}{2}$) | B. | (2,$\frac{7}{2}$) | C. | (1,2) | D. | (2,2) |
4.
如图,过点C(-2,5)的直线AB分别交坐标轴于A(0,2),B两点,则tan∠OAB=( )
| A. | $\frac{2}{5}$ | B. | $\frac{2}{3}$ | C. | $\frac{5}{2}$ | D. | $\frac{3}{2}$ |
3.若关于x的一元二次方程ax2-bx+4=0的解是x=2,则2017+2a-b=( )
| A. | 2015 | B. | 2017 | C. | 2019 | D. | 2020 |
19.
如图,半径为1的⊙O与正六边形ABCDEF相切于点A、D,则$\widehat{AD}$的长为( )
0 294274 294282 294288 294292 294298 294300 294304 294310 294312 294318 294324 294328 294330 294334 294340 294342 294348 294352 294354 294358 294360 294364 294366 294368 294369 294370 294372 294373 294374 294376 294378 294382 294384 294388 294390 294394 294400 294402 294408 294412 294414 294418 294424 294430 294432 294438 294442 294444 294450 294454 294460 294468 366461
| A. | $\frac{1}{6}$π | B. | $\frac{1}{3}$π | C. | $\frac{2}{3}$π | D. | $\frac{5}{6}$π |