如图,已知△ABC内接于⊙O,D是⊙O上一点,连接BD、CD、AC、BD交于点E.
(1)请找出图中的相似三角形,并加以证明;
(2)若∠D=45°,BC=2,求⊙O的面积.
(1)请找出图中的相似三角形,并加以证明;
(2)若∠D=45°,BC=2,求⊙O的面积.
![](https://img.xkw.com/dksih/QBM/2020/3/22/2425188484136960/2425887481225216/STEM/eca808723dcc4611b307080ca6a78b53.png?resizew=115)
更新时间:2020-03-23 19:43:37
|
相似题推荐
解答题-证明题
|
适中
(0.65)
【推荐1】如图,
是
直径,弦
于点E,过点C作
的垂线,交
的延长线于点G,垂足为点F,连结
,其中
.
![](https://img.xkw.com/dksih/QBM/2023/6/22/3265393153122304/3265798236823552/STEM/076811f86b794920806a748be4b456c4.png?resizew=174)
(1)求证:
;
(2)若
,求
的半径.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b757f0c42ae5c9a2d6a4b19e5877b27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d97dc3b752832906de41447bb58a341.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/439fbb8974a5f907205d26b47b420bf4.png)
![](https://img.xkw.com/dksih/QBM/2023/6/22/3265393153122304/3265798236823552/STEM/076811f86b794920806a748be4b456c4.png?resizew=174)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/139bb4704fedc97e2ce958b8038c0e58.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c037431f715d76ef3d7c1763484923a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
名校
【推荐2】如图,AB是⊙O的直径,E为⊙O上一点,过弧AE的中点C作CD⊥AB,垂足为D,AE交CD于点F,连接AC.求证:AF=CF
![](https://img.xkw.com/dksih/QBM/2020/11/1/2583777252597760/2596551263707136/STEM/4d6cf6a6-6539-4cbc-8287-1b58a6d3595e.png?resizew=178)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
解题方法
【推荐1】如图,在
中,
,以
为直径的
交
于点
,交
于点
.过点
作
于点
.
![](https://img.xkw.com/dksih/QBM/2020/7/4/2498576774029312/2498686866808832/STEM/84922b3555bb4b459208626750180293.png?resizew=148)
(1)求证:直线
是
的切线;
(2)若
,
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab00e0cff0876c4183a47f1272cf9928.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/2020/7/4/2498576774029312/2498686866808832/STEM/84922b3555bb4b459208626750180293.png?resizew=148)
(1)求证:直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/348216467fda035329fe8fac46b39911.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50f218914337edd06e59e75d90b777e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5cb63aeea0b37799404c8fec092b21d.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐2】如图所示,
是
的直径,
是
的弦,
的平分线交
于点
.若
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc34db5860990e51ba31edc8cdd077c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1682d306c38087d9e6f7efb9cec596a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec451c43455189eae382b7709b3ae80e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/21/3d82cb57-f666-4a42-9fff-22e48dda82b5.png?resizew=129)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐2】如图,在
中,
,
是
的中线,作
于点E.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/21/f3fd74d6-8247-4c45-a299-bb329a35f0c1.png?resizew=158)
(1)求证:
;
(2)若
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4611ceb2a28f7a7e4d24266d7f99b22.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/21/f3fd74d6-8247-4c45-a299-bb329a35f0c1.png?resizew=158)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/128cde436e3c7ca52435c287c9958777.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62eccb33ea66c03222468628f74d8c56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/348fb71fbc47fd87e9ce011652ef4186.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
您最近一年使用:0次