1 .
如图,三角形ABC中,AC=BC=
,四边形ABED是正方形,平面ABED⊥底面ABC,若G、F分别是EC、BD的中点.
(1)求证:GF//底面ABC;
(2)求证:AC⊥平面EBC;
(3)若正方形ABED的边长为1,求几何体ADEBC的体积.
如图,三角形ABC中,AC=BC=
![](https://img.xkw.com/dksih/QBM/2011/12/10/1570568744722432/1570568750071808/STEM/7e09b1f4474d4f2eb03a24c58de6dce3.png)
(1)求证:GF//底面ABC;
(2)求证:AC⊥平面EBC;
(3)若正方形ABED的边长为1,求几何体ADEBC的体积.
![](https://img.xkw.com/dksih/QBM/2011/12/10/1570568744722432/1570568750071808/STEM/8863295ae71243e1bc692f5cf38705fb.png)
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2 . 一个几何体的三视图如下图所示(单位:
).
![](https://img.xkw.com/dksih/QBM/2016/11/22/1573166371536896/1573166377910272/STEM/c134f632999d4ea594b80e0a4a2dd946.png?resizew=247)
(1)该几何体是由哪些简单几何体组成的;
(2)求该几何体的表面积和体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://img.xkw.com/dksih/QBM/2016/11/22/1573166371536896/1573166377910272/STEM/c134f632999d4ea594b80e0a4a2dd946.png?resizew=247)
(1)该几何体是由哪些简单几何体组成的;
(2)求该几何体的表面积和体积.
您最近一年使用:0次
2016-12-05更新
|
585次组卷
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2卷引用:安徽省滁州市定远县育才学校2020-2021学年高二上学期期末数学(理)试题
3 . 如图,在直角梯形
中,
,
,
,
.将
(及其内部)绕
所在的直线旋转一周,形成一个几何体.
![](https://img.xkw.com/dksih/QBM/2011/2/23/1570007715217408/1570007720427520/STEM/86df55ba9bf546d591b9e38f4107a84d.png?resizew=267)
(1)求该几何体的体积
;
(2)设直角梯形
绕底边
所在的直线旋转角
(
)至
,问:是否存在
,使得
.若存在,求角
的值,若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70ac80190d4e6bed8991344d6ee330e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21ea52361458ce2e49ed0fe99d8e6c02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a3f9d14b1808019e821b8e8b9f2df24.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa7aeb2a8d1437eeb4482c3b6ad9f315.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/2011/2/23/1570007715217408/1570007720427520/STEM/86df55ba9bf546d591b9e38f4107a84d.png?resizew=267)
(1)求该几何体的体积
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be54e84508decfcce6d2fcbe6c8c1a92.png)
(2)设直角梯形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92aad3bc955e564ac87c21a11f4d7579.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/662b5564c5e652d18d4ecd67ded2e273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77ff6949d55130f7a838cde45fd0e819.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
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12-13高一上·吉林·期末
解题方法
4 . 如图,这是一个奖杯的三视图,(1)请你说明这个奖杯是由哪些基本几何体组成的;(2)求出这个奖杯的体积(列出计算式子,将数字代入即可,不必求出最终结果).
![](https://img.xkw.com/dksih/QBM/2012/2/1/1570709830623232/1570709835808768/STEM/dd15faab-b82b-42e9-b2c9-55e0ed5d7998.png?resizew=617)
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