如图,△ABC是直角三角形,∠ACB=90°.
![](https://img.xkw.com/dksih/QBM/2011/8/1/1573231480963072/1573231556714496/STEM/2df86996720e40debe49a8177c2c398e.png?resizew=106)
(1)实践与操作利用尺规按下列要求作图,并在图中标明相应的字母(保留作图痕迹,不写作法).
①作△ABC的外接圆,圆心为O;
②以线段AC为一边,在AC的右侧作等边△ACD;
③连接BD,交⊙O于点E,连接AE,
(2)综合与运用 在你所作的图中,若AB=4,BC=2,则:
①AD与⊙O的位置关系是______.
②线段AE的长为__________.
![](https://img.xkw.com/dksih/QBM/2011/8/1/1573231480963072/1573231556714496/STEM/2df86996720e40debe49a8177c2c398e.png?resizew=106)
(1)实践与操作利用尺规按下列要求作图,并在图中标明相应的字母(保留作图痕迹,不写作法).
①作△ABC的外接圆,圆心为O;
②以线段AC为一边,在AC的右侧作等边△ACD;
③连接BD,交⊙O于点E,连接AE,
(2)综合与运用 在你所作的图中,若AB=4,BC=2,则:
①AD与⊙O的位置关系是______.
②线段AE的长为__________.
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更新时间:2016-12-05 03:30:42
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解答题-作图题
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适中
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名校
【推荐1】尺规作图(要求:不写作法,保留作图痕迹)
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【推荐2】用圆规、直尺作图,不写作法,但要保留作图痕迹.求作:正方形
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【推荐1】如图,在等边三角形ABC的三边上,分别取点D.E.F,使得△DEF为等边三角形,求证:AD=BE=CF.
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解答题-作图题
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【推荐2】如图,
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【推荐1】如图,在△ABC中,AD为BC边上的高,若BD=4,DC=5,AD=2
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解答题-证明题
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【推荐2】如图,河南周口市中原路沙颖河大桥采用下承式圆弧拱形结构,夜晚在霓虹灯下、展现出“一轮明月照古城”的美丽景象,设圆弧的端点为
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,
为如图圆弧上一点,过点
作
的切线交直线
于点
,连接
、
.
(1)求证:
;
(2)对于试题“若
,
,求
的长”,下面是参考答案的一部分,请你在此基础上继续进行解答.
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连接
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∵
,
∴
,
∴
,
在
中,
,
在
中,
,
…
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(1)求证:
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(2)对于试题“若
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连接
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∵
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∴
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∴
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在
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在
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解答题-问答题
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适中
(0.65)
【推荐1】如图,在
中,
,以
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(1)求证:
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(2)若
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解答题-证明题
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【推荐2】如图,
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内接于
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是
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(1)求证:
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(2)若
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(1)求证:
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(2)若
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