7.
如图,在矩形ABCD中,AB=4cm,AD=5cm.点E在BC边上,且BE=1cm,AF平分∠BAD.图中P为AF上任意一点,若P为AF上任意一动点,请确定一点P,连接BP、EP,则BP+EP的最小值为( )
| A. | 4cm | B. | 5cm | C. | 4$\sqrt{2}$cm | D. | 3cm |
6.
如图所示,正三角形ABC的边长为2,$\frac{AE}{BE}$=2,$\frac{AD}{DC}$=$\frac{1}{2}$,BD交CE于点F,则△AEF的外接圆半径长为( )
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| A. | $\frac{2}{3}$ | B. | $\frac{\sqrt{3}}{3}$ | C. | $\frac{2\sqrt{3}}{3}$ | D. | $\frac{4\sqrt{3}}{7}$ |