已知如图所示,∠ADC=∠ABC=90°,AD=CD,DP⊥AB于P,DP=3,求四边形ABCD的面积.
![](https://img.xkw.com/dksih/QBM/2021/3/17/2679966438408192/2681436141051904/STEM/a4d466e2851440ed99d2888cd2d7b4d9.png?resizew=144)
更新时间:2021-03-19 20:58:42
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解答题-证明题
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【推荐1】在边长为4的正方形中,对角线
相交于点O,点P为对角线
上一动点,连接
,以
为斜边在直线
的上方构造等腰直角三角形
,连接
.
(1)如图1,当点P与点B重合时.求证:
①;
②四边形是平行四边形;
(2)如图2,当点P在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/013d26b5112e3a11b81955bd65043ddc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/013d26b5112e3a11b81955bd65043ddc.png)
(3)如图3,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/208779e7d75e0bf9250a1abe7f6c5467.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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解答题-证明题
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【推荐2】如图,已知
,E,F是
上两点且
.
![](https://img.xkw.com/dksih/QBM/2021/8/6/2780342524207104/2780432162070528/STEM/826f7bf529c843eeb9421067363196bb.png?resizew=175)
(1)求证:
;
(2)连接
,若
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c60136eb6e9c4603cdec96b44091f97d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7c581dab991aeadf06d972e47673ea8.png)
![](https://img.xkw.com/dksih/QBM/2021/8/6/2780342524207104/2780432162070528/STEM/826f7bf529c843eeb9421067363196bb.png?resizew=175)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d99bb3ab66b8884bf23cffe1bddcb33.png)
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5bf2ef5afe8908cffcfa6d0d1b4e1d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d29e7c4d6216690152430b09f9cf0c2.png)
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【推荐1】如图,在平行四边形ABCD中,对角线AC、BD交于点O,E是BD延长线上的点,且△ACE是等边三角形.
![](https://img.xkw.com/dksih/QBM/2021/6/28/2752628906065920/2773280518021120/STEM/3e4b1659-38e7-4919-af6e-1af43590c2e3.png)
(1)求证:四边形ABCD是菱形.
(2)当∠EAD等于多少度时,四边形ABCD是正方形.并写出推理过程.
![](https://img.xkw.com/dksih/QBM/2021/6/28/2752628906065920/2773280518021120/STEM/3e4b1659-38e7-4919-af6e-1af43590c2e3.png)
(1)求证:四边形ABCD是菱形.
(2)当∠EAD等于多少度时,四边形ABCD是正方形.并写出推理过程.
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【推荐2】如图,
和
中,
,
是
的中点,且
于点
,且
,
交
于点
.
![](https://img.xkw.com/dksih/QBM/2022/1/6/2895218968584192/2896548244176896/STEM/72eb84f8-6acc-4db5-8b10-e39b29f25374.png?resizew=221)
(1)求证:
;
(2)求
与
的面积之比.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0005e1ef60f6ddc5f9a83e3de1ef3b2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/270f9b9eb16659297fe011d786950009.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f8daff96303a07819bd4ee47731e73b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a510a3eb906b3ef0760b0d1723d11ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://img.xkw.com/dksih/QBM/2022/1/6/2895218968584192/2896548244176896/STEM/72eb84f8-6acc-4db5-8b10-e39b29f25374.png?resizew=221)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ddfbd95d65eb10d5794257589e12e99a.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dddb32a7a5c157fdf8aa049b2d665b4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f955e5cc9f108de6f3ca01e5eb84c52e.png)
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