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(2005•扬州)如图是利用四边形的不稳定性制作的菱形凉衣架.已知其中每个菱形的...
(2005•扬州)如图是利用四边形的不稳定性制作的菱形凉衣架.已知其中每个菱形的边长为20cm,在墙上悬挂凉衣架的两个铁钉A、B之间的距离为20
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cm,则∠1=
度.
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