以下说法中,正确的个数有( )
(1)在坐标轴上的点横坐标、纵坐标都是零;
(2)点P(2,﹣3)到x轴的距离为3;
(3)三角形的三条高都在三角形内部;
(4)平分三角形内角的射线叫三角形的角平分线.
(1)在坐标轴上的点横坐标、纵坐标都是零;
(2)点P(2,﹣3)到x轴的距离为3;
(3)三角形的三条高都在三角形内部;
(4)平分三角形内角的射线叫三角形的角平分线.
A.1 | B.2 | C.3 | D.4 |
2021七年级下·全国·专题练习 查看更多[1]
(已下线)第十五章 平面直角坐标系(基础卷)-2020-2021学年七年级数学下学期期末专项复习(沪教版)
更新时间:2021-06-11 11:16:18
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【推荐1】下列说法不正确的是( )
A.点![]() | B.点![]() ![]() |
C.若![]() ![]() ![]() ![]() | D.若![]() ![]() ![]() |
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【推荐2】已知y轴上点P到x轴的距离为3,则点P坐标为( )
A.(0,3) | B.(3,0) |
C.(0,3)或(0,﹣3) | D.(3,0)或(﹣3,0) |
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【推荐1】下列说法中,正确的个数是( )
①三角形的三条高都在三角形内,且都交于一点
②任意三角形的外角和都是![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b2ccc34a8b3cf908af78bdbe804afac.png)
③三角形的一个外角大于任何一个内角
④在
中,当
时,这个三角形是直角三角形
①三角形的三条高都在三角形内,且都交于一点
②任意三角形的外角和都是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b2ccc34a8b3cf908af78bdbe804afac.png)
③三角形的一个外角大于任何一个内角
④在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】下列尺规作图,能判断
是
的
边上的高的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
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【推荐1】如图,在
中,
,
、
分别为
、
的中点,
平分
,交
于点
,若
,
,则
的长为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
A.2 | B.1 | C.4 | D.![]() |
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【推荐2】如图,在▱
中,
,下列两种方案中所得四边形为平行四边形的是(
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方案Ⅰ:在
和
上分别截取
和
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和
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.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/31/59822079-6c72-45fc-970f-b776480b8f79.jpg?resizew=152)
方案Ⅱ:作
的平分线
交
于点
,
的平分线
交
于点
,得到四边形
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/31/25ee19be-6a1f-4599-be35-f4c4284f8282.jpg?resizew=152)
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方案Ⅰ:在
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6b41d4070854edfaa24071137b314cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79ff575e55857af133edb24c8e61504f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3783ac865e5669312cd2d11e5da08f11.png)
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方案Ⅱ:作
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A.方案Ⅰ | B.方案Ⅱ | C.两种方案都行 | D.两种方案都不行 |
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