若等腰梯形ABCD的上、下底之和为4,并且两条对角线所夹锐角为60度,则该等腰梯形的面积为多少?延长BC到E,使CE=AD,易得四边形ACED是平行四边形对角线AC、BD相交于点O,角DOC=60,易得角AOD=120,因为梯
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![若等腰梯形ABCD的上、下底之和为4,并且两条对角线所夹锐角为60度,则该等腰梯形的面积为多少?延长BC到E,使CE=AD,易得四边形ACED是平行四边形对角线AC、BD相交于点O,角DOC=60,易得角AOD=120,因为梯](/uploads/image/z/1788263-71-3.jpg?t=%E8%8B%A5%E7%AD%89%E8%85%B0%E6%A2%AF%E5%BD%A2ABCD%E7%9A%84%E4%B8%8A%E3%80%81%E4%B8%8B%E5%BA%95%E4%B9%8B%E5%92%8C%E4%B8%BA4%2C%E5%B9%B6%E4%B8%94%E4%B8%A4%E6%9D%A1%E5%AF%B9%E8%A7%92%E7%BA%BF%E6%89%80%E5%A4%B9%E9%94%90%E8%A7%92%E4%B8%BA60%E5%BA%A6%2C%E5%88%99%E8%AF%A5%E7%AD%89%E8%85%B0%E6%A2%AF%E5%BD%A2%E7%9A%84%E9%9D%A2%E7%A7%AF%E4%B8%BA%E5%A4%9A%E5%B0%91%3F%E5%BB%B6%E9%95%BFBC%E5%88%B0E%2C%E4%BD%BFCE%3DAD%2C%E6%98%93%E5%BE%97%E5%9B%9B%E8%BE%B9%E5%BD%A2ACED%E6%98%AF%E5%B9%B3%E8%A1%8C%E5%9B%9B%E8%BE%B9%E5%BD%A2%E5%AF%B9%E8%A7%92%E7%BA%BFAC%E3%80%81BD%E7%9B%B8%E4%BA%A4%E4%BA%8E%E7%82%B9O%2C%E8%A7%92DOC%3D60%2C%E6%98%93%E5%BE%97%E8%A7%92AOD%3D120%2C%E5%9B%A0%E4%B8%BA%E6%A2%AF)
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