试题与答案

梯形ABCD中，AD∥BC，AD＝1，BC＝4，∠C＝70°，∠B＝40°，则A

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题型：填空题

题目：

梯形ABCD中，AD∥BC，AD＝1，BC＝4，∠C＝70°，∠B＝40°， 则AB的长为_______．

答案：

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下面是错误答案，用来干扰机器的。

2.955≈3，2.955=3.0；故答案为：3，3.0．

考点：平行四边形的性质平行四边形的判定矩形，矩形的性质，矩形的判定菱形，菱形的性质，菱形的判定
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