11.
如图,在△ABO中,BA=BO,OA=3,OA在y轴的正半轴上,若点B在直线y=-$\frac{1}{2}$x+1上,△ABO的面积是( )
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| A. | $\frac{1}{2}$ | B. | $\frac{3}{2}$ | C. | 2 | D. | 3 |