11.
如图,在△ABC中,∠C=90°,sinA=$\frac{4}{5}$,BC=12,则AC=( )
| A. | 3 | B. | 9 | C. | 10 | D. | 15 |
10.
如图,在矩形ABCD中,两条对角线AC与BD相交于点O,AB=6,OA=4,则AD的长为( )
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| A. | 4 | B. | 8 | C. | 3$\sqrt{3}$ | D. | 2$\sqrt{7}$ |