题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108004316-34032.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108004316-24205.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108004316-34032.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108004316-86664.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108004316-19160.png)
A.![]() | B.![]() | C.![]() | D.![]() |
答案
解析
试题分析:由于上底和两腰长已知,故要求梯形面积,关键是要找出底边上和高,由于图形中无法再分析出边与边的关系,所以我们可以从角的方向入手,求梯形的内角。解:设等腰梯形的底角为θ,则由图可知,θ+θ+θ=180°,即θ=60°.故选C.
点评:本小题主要考查梯形与平行四边形的有关知识,以及分析问题和解决问题的能力,以及转化与化归的思想方法.本题的切入点是求梯形的内角,如何由已知分析出该点,是解题的关键.
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108004309-79560.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108004309-16364.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108004309-50166.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108004309-14492.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108004309-30986.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108004309-50166.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108004309-86373.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108004309-42869.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108004310-51687.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108004310-73418.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108004310-68673.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108004301-46515.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108004301-55134.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108004301-69922.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108004301-55134.png)
(Ⅰ)求
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108004301-55508.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108004301-55134.png)
(Ⅱ)圆C的参数方程为
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108004302-87285.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108004256-35908.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108004256-64989.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108004250-36242.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108004250-59513.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108004250-94496.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108004250-59513.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108004250-94069.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108004251-72154.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108004251-30759.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108004250-94496.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108004250-59513.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108004251-37004.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108004251-32093.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108004251-36780.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108004251-93647.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108004252-97342.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108004252-21826.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108004240-79415.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108004240-19677.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108004240-74209.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108004240-19677.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108004240-57511.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108004240-62340.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108004240-74209.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108004240-45447.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108004241-13554.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108004240-74209.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108004241-66650.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108004241-20118.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108004241-82042.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108004241-32103.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108004241-78317.jpg)
(1)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108004241-10700.png)
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108004241-41474.png)
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