1.菱形ABCD的周长为28cm,角BAD=1/2角ABC,则BD= ,AC= .2.菱形两条对角线之比为3:4,周长为40cm,则该菱形的面积为 ,高为 .3.两张等宽的纸条交叉重叠在一起,重叠的部分ABCD是菱形吗?(以上3题写出步骤)
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![1.菱形ABCD的周长为28cm,角BAD=1/2角ABC,则BD= ,AC= .2.菱形两条对角线之比为3:4,周长为40cm,则该菱形的面积为 ,高为 .3.两张等宽的纸条交叉重叠在一起,重叠的部分ABCD是菱形吗?(以上3题写出步骤)](/uploads/image/z/11548022-14-2.jpg?t=1.%E8%8F%B1%E5%BD%A2ABCD%E7%9A%84%E5%91%A8%E9%95%BF%E4%B8%BA28cm%2C%E8%A7%92BAD%3D1%2F2%E8%A7%92ABC%2C%E5%88%99BD%3D+%2CAC%3D+.2.%E8%8F%B1%E5%BD%A2%E4%B8%A4%E6%9D%A1%E5%AF%B9%E8%A7%92%E7%BA%BF%E4%B9%8B%E6%AF%94%E4%B8%BA3%EF%BC%9A4%2C%E5%91%A8%E9%95%BF%E4%B8%BA40cm%2C%E5%88%99%E8%AF%A5%E8%8F%B1%E5%BD%A2%E7%9A%84%E9%9D%A2%E7%A7%AF%E4%B8%BA+%2C%E9%AB%98%E4%B8%BA+.3.%E4%B8%A4%E5%BC%A0%E7%AD%89%E5%AE%BD%E7%9A%84%E7%BA%B8%E6%9D%A1%E4%BA%A4%E5%8F%89%E9%87%8D%E5%8F%A0%E5%9C%A8%E4%B8%80%E8%B5%B7%2C%E9%87%8D%E5%8F%A0%E7%9A%84%E9%83%A8%E5%88%86ABCD%E6%98%AF%E8%8F%B1%E5%BD%A2%E5%90%97%3F%EF%BC%88%E4%BB%A5%E4%B8%8A3%E9%A2%98%E5%86%99%E5%87%BA%E6%AD%A5%E9%AA%A4%EF%BC%89)
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