如图,在平行四边形ABCD中,AE垂直BC于点E,AF垂直CD于点F.若AE=3,AF=4,AD=81.求CD的长及ABCD的周长2.若∠EAF=60°,求平行四边形ABCD各内角的度数3.若在平行四边形ABCD中,BC=12,AD于BC间的距离为5CM,AC于BD交于
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![如图,在平行四边形ABCD中,AE垂直BC于点E,AF垂直CD于点F.若AE=3,AF=4,AD=81.求CD的长及ABCD的周长2.若∠EAF=60°,求平行四边形ABCD各内角的度数3.若在平行四边形ABCD中,BC=12,AD于BC间的距离为5CM,AC于BD交于](/uploads/image/z/1818734-14-4.jpg?t=%E5%A6%82%E5%9B%BE%2C%E5%9C%A8%E5%B9%B3%E8%A1%8C%E5%9B%9B%E8%BE%B9%E5%BD%A2ABCD%E4%B8%AD%2CAE%E5%9E%82%E7%9B%B4BC%E4%BA%8E%E7%82%B9E%2CAF%E5%9E%82%E7%9B%B4CD%E4%BA%8E%E7%82%B9F.%E8%8B%A5AE%3D3%2CAF%3D4%2CAD%3D81.%E6%B1%82CD%E7%9A%84%E9%95%BF%E5%8F%8AABCD%E7%9A%84%E5%91%A8%E9%95%BF2.%E8%8B%A5%E2%88%A0EAF%3D60%C2%B0%2C%E6%B1%82%E5%B9%B3%E8%A1%8C%E5%9B%9B%E8%BE%B9%E5%BD%A2ABCD%E5%90%84%E5%86%85%E8%A7%92%E7%9A%84%E5%BA%A6%E6%95%B03.%E8%8B%A5%E5%9C%A8%E5%B9%B3%E8%A1%8C%E5%9B%9B%E8%BE%B9%E5%BD%A2ABCD%E4%B8%AD%2CBC%EF%BC%9D12%2CAD%E4%BA%8EBC%E9%97%B4%E7%9A%84%E8%B7%9D%E7%A6%BB%E4%B8%BA5CM%2CAC%E4%BA%8EBD%E4%BA%A4%E4%BA%8E)
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