如图,在中,
,
的内切
分别与
、
、
切于点
、
、
,
,
,则阴影部分的面积为
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/19/ba142da1-24f4-4a3f-9b16-2e4b73379135.png?resizew=186)
更新时间:2024-03-20 06:30:19
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【推荐1】如图,在
中,
.如果在三角形内部有一条动线段
,且
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【推荐2】如图,已知□ABCD中,AB=30cm,AC=40cm,BC=50cm,边AD的中点为E,有一动点P从点B出发以1cm/秒的速度,沿边BC→CD运动至D点停止,若点P、E、C三点为顶点,构成以EP为腰的等腰△PEC时,运动时间为_______ .
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【推荐1】我国古代数学家赵爽的“弦图”是由四个全等的直角三角形和一个小正方形拼成的一个大正方形(如图所示).若直角三角形的内切圆半径为1,大正方形的面积为64,则小正方形的边长为 _________ .
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【推荐2】如图,在平面直角坐标系中,
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【推荐2】如图,矩形
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【推荐1】如图,在△ABC中,AB=AC=15,点D是BC边上的一动点(不与B、C重合),∠ADE=∠B=∠α,DE交AB于点E,且tan∠α=
.有以下的结论:
![](https://img.xkw.com/dksih/QBM/2015/8/20/1573898389078016/1573898395262976/STEM/5d5c34f091f549a0b81890ea51cb419c.png?resizew=227)
①△ADE∽△ACD;
②当CD=9时,△ACD与△DBE全等;
③△BDE为直角三角形时,BD为12或
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①△ADE∽△ACD;
②当CD=9时,△ACD与△DBE全等;
③△BDE为直角三角形时,BD为12或
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/679ec4b3991a6a773a89b3d1b0160eae.png)
④0<BE≤
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其中正确的结论是
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【推荐2】如图,在
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