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專(zhuān)題06五大常考相似模型一、【知識(shí)回顧】模型一:A字模型模型二:8字模型模型三:子母模型(射影定理)模型四:一線三等角模型模型五:手拉手模型(旋轉(zhuǎn)模型)二、【考點(diǎn)類(lèi)型】考點(diǎn)1:A字模型典例1:(2021秋·安徽安慶·九年級(jí)安慶市石化第一中學(xué)??计谥校﹫D,SKIPIF1<0,點(diǎn)H在BC上,AC與BD交于點(diǎn)G,AB=2,CD=3,求GH的長(zhǎng).【變式1】(2022·廣東深圳·深圳市華勝實(shí)驗(yàn)學(xué)校??家荒#┤鐖D,在⊙O中,SKIPIF1<0,CD⊥AB于點(diǎn)F,交⊙O于點(diǎn)D,AO的延長(zhǎng)線交CD于點(diǎn)E.(1)求證:AE⊥BC;(2)求證:DF=EF;(3)若SKIPIF1<0,求SKIPIF1<0的值.【變式2】(2023春·安徽六安·九年級(jí)校聯(lián)考階段練習(xí))如圖,在SKIPIF1<0中,SKIPIF1<0,SKIPIF1<0平分SKIPIF1<0交SKIPIF1<0于點(diǎn)SKIPIF1<0,SKIPIF1<0的垂直平分線交SKIPIF1<0于點(diǎn)SKIPIF1<0,以點(diǎn)SKIPIF1<0為圓心,以SKIPIF1<0長(zhǎng)為半徑作⊙SKIPIF1<0,交SKIPIF1<0于點(diǎn)SKIPIF1<0.(1)求證:SKIPIF1<0是⊙SKIPIF1<0的切線;(2)已知SKIPIF1<0,SKIPIF1<0,求⊙SKIPIF1<0的半徑.【變式3】(2023·全國(guó)·九年級(jí)專(zhuān)題練習(xí))如圖,在SKIPIF1<0中,SKIPIF1<0,D是SKIPIF1<0上一點(diǎn),點(diǎn)E在SKIPIF1<0上,連接SKIPIF1<0交于點(diǎn)F,若SKIPIF1<0,則SKIPIF1<0=__________.考點(diǎn)2:8字模型典例2:(2021秋·重慶·九年級(jí)校聯(lián)考期末)如圖SKIPIF1<0與SKIPIF1<0交于SKIPIF1<0,且SKIPIF1<0.(1)求證:SKIPIF1<0∽SKIPIF1<0.(2)若SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,求SKIPIF1<0的長(zhǎng).【變式1】39.(2021春·全國(guó)·九年級(jí)專(zhuān)題練習(xí))已知:如圖,在△ABC中,點(diǎn)D、E分別在邊AB、AC上,DE∥BC,點(diǎn)F在邊AB上,BC2=BF?BA,CF與DE相交于點(diǎn)G.(1)求證:DF?AB=BC?DG;(2)當(dāng)點(diǎn)E為AC中點(diǎn)時(shí),求證:2DF?EG=AF?DG.【變式2】(2023·山西太原·山西實(shí)驗(yàn)中學(xué)??家荒#┤鐖D所示,在SKIPIF1<0中,兩條弦SKIPIF1<0相交于點(diǎn)E,連接SKIPIF1<0,則下列說(shuō)法中錯(cuò)誤的是(

)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0考點(diǎn)3:子母模型(射影定理)典例3:(2022·遼寧營(yíng)口·一模)如圖,SKIPIF1<0,SKIPIF1<0是SKIPIF1<0的直徑,SKIPIF1<0為SKIPIF1<0的切線,SKIPIF1<0為切點(diǎn),連接SKIPIF1<0,過(guò)點(diǎn)SKIPIF1<0作SKIPIF1<0于點(diǎn)SKIPIF1<0,延長(zhǎng)SKIPIF1<0交SKIPIF1<0于點(diǎn)SKIPIF1<0,交SKIPIF1<0于點(diǎn)SKIPIF1<0,交SKIPIF1<0于點(diǎn)SKIPIF1<0,連接SKIPIF1<0.(1)求證:SKIPIF1<0;(2)若SKIPIF1<0半徑為SKIPIF1<0,SKIPIF1<0,求SKIPIF1<0的長(zhǎng).【變式1】(2022·陜西西安·西北大學(xué)附中??寄M預(yù)測(cè))如圖,SKIPIF1<0是SKIPIF1<0的內(nèi)接三角形,過(guò)點(diǎn)SKIPIF1<0作SKIPIF1<0的切線交SKIPIF1<0的延長(zhǎng)線于點(diǎn)SKIPIF1<0,SKIPIF1<0于點(diǎn)SKIPIF1<0,交SKIPIF1<0于點(diǎn)SKIPIF1<0.(1)求證:SKIPIF1<0;(2)若SKIPIF1<0,SKIPIF1<0,求線段SKIPIF1<0的長(zhǎng).【變式2】(2022·江蘇·九年級(jí)專(zhuān)題練習(xí))如圖,在Rt△ABC中,∠ACB=90°,點(diǎn)D在AB上,且SKIPIF1<0=SKIPIF1<0.(1)求證△ACD∽△ABC;(2)若AD=3,BD=2,求CD的長(zhǎng).考點(diǎn)4:一線三等角模型(重點(diǎn))典例4:(2020秋·寧夏銀川·九年級(jí)??茧A段練習(xí))將一副三角尺如圖①擺放,在SKIPIF1<0中,SKIPIF1<0;在SKIPIF1<0中,SKIPIF1<0,點(diǎn)SKIPIF1<0為SKIPIF1<0的中點(diǎn),SKIPIF1<0交SKIPIF1<0于點(diǎn)SKIPIF1<0,SKIPIF1<0經(jīng)過(guò)點(diǎn)SKIPIF1<0.(1)求SKIPIF1<0的度數(shù);(2)如圖②,將SKIPIF1<0繞點(diǎn)SKIPIF1<0順時(shí)針?lè)较蛐D(zhuǎn)角SKIPIF1<0(SKIPIF1<0),此時(shí)的等腰直角三角尺記為SKIPIF1<0,SKIPIF1<0交SKIPIF1<0于點(diǎn)SKIPIF1<0,SKIPIF1<0交SKIPIF1<0于點(diǎn)SKIPIF1<0,試判斷SKIPIF1<0的值是否隨著SKIPIF1<0的變化而變化?如果不變,請(qǐng)求出SKIPIF1<0的值;反之,請(qǐng)說(shuō)明理由.【變式1】(2023春·廣東佛山·九年級(jí)??茧A段練習(xí))如圖,在等邊△ABC中,P為BC上一點(diǎn),D為AC上一點(diǎn),且∠APD=60°,2BP=3CD,BP=1.(1)求證△ABP∽△PCD;(2)求△ABC的邊長(zhǎng).【變式2】(2023·全國(guó)·九年級(jí)專(zhuān)題練習(xí))如圖,四邊形SKIPIF1<0是矩形,點(diǎn)P是對(duì)角線AC上一動(dòng)點(diǎn)(不與A、C重合),連接SKIPIF1<0,過(guò)點(diǎn)P作SKIPIF1<0,交SKIPIF1<0于點(diǎn)E,已知SKIPIF1<0,SKIPIF1<0.設(shè)SKIPIF1<0的長(zhǎng)為x.(1)SKIPIF1<0___________;當(dāng)SKIPIF1<0時(shí),求SKIPIF1<0的值;(2)試探究:SKIPIF1<0是否是定值?若是,請(qǐng)求出這個(gè)值;若不是,請(qǐng)說(shuō)明理由;(3)當(dāng)SKIPIF1<0是等腰三角形時(shí),請(qǐng)求出SKIPIF1<0的值.【變式3】(2020春·重慶沙坪壩·九年級(jí)重慶八中??茧A段練習(xí))如圖,點(diǎn)SKIPIF1<0是正SKIPIF1<0兩邊上的點(diǎn),將SKIPIF1<0沿直線SKIPIF1<0翻折,點(diǎn)SKIPIF1<0的對(duì)應(yīng)點(diǎn)恰好落在邊SKIPIF1<0上,當(dāng)SKIPIF1<0時(shí),SKIPIF1<0的值是(

)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0考點(diǎn)5:手拉手模型(重點(diǎn))典例5:(2023春·湖北襄陽(yáng)·九年級(jí)統(tǒng)考階段練習(xí))(1)問(wèn)題探究:如圖1,SKIPIF1<0,SKIPIF1<0均為等邊三角形,連接SKIPIF1<0、SKIPIF1<0,求證:SKIPIF1<0.(2)類(lèi)比延伸:如圖2,在SKIPIF1<0和SKIPIF1<0中,SKIPIF1<0,SKIPIF1<0,連接SKIPIF1<0、SKIPIF1<0,求證:SKIPIF1<0.(3)拓展遷移:如圖3,在四邊形SKIPIF1<0中,SKIPIF1<0,且SKIPIF1<0,SKIPIF1<0,若將線段SKIPIF1<0繞點(diǎn)D按逆時(shí)針?lè)较蛐D(zhuǎn)SKIPIF1<0得到SKIPIF1<0,連接SKIPIF1<0,求線段SKIPIF1<0的長(zhǎng).【變式1】(2021秋·重慶渝北·九年級(jí)統(tǒng)考期末)如圖,在等邊三角形SKIPIF1<0中,點(diǎn)SKIPIF1<0,SKIPIF1<0分別是邊SKIPIF1<0,SKIPIF1<0上的點(diǎn).將SKIPIF1<0沿SKIPIF1<0翻折,點(diǎn)SKIPIF1<0正好落在線段SKIPIF1<0上的點(diǎn)SKIPIF1<0處,使得SKIPIF1<0.若SKIPIF1<0,則SKIPIF1<0的長(zhǎng)度為(

)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【變式2】(2020·江蘇常州·統(tǒng)考一模)如圖,在平面直角坐標(biāo)系中,△AOB中,∠AOB=90°,∠ABO=30°,頂點(diǎn)A在反比例函y=SKIPIF1<0(x>0)上運(yùn)動(dòng),此時(shí)頂點(diǎn)B也在反比例函數(shù)y=SKIPIF1<0上運(yùn)動(dòng),則m的值為(

)A.-9 B.-12 C.-15 D.-18鞏固訓(xùn)練一、單選題1.(2021·山東臨沂·三模)如圖,在△ABC中,DE∥BC,若AE=2,EC=3,則△ADE與△ABC的面積之比為(

)A.4:25 B.2:3 C.4:9 D.2:52.(2023·全國(guó)·九年級(jí)專(zhuān)題練習(xí))如圖,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0分別交SKIPIF1<0于點(diǎn)G,H,則下列結(jié)論中錯(cuò)誤的是(

)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<03.(2013·海南·中考真題)直線l1∥l2∥l3,且l1與l2的距離為1,l2與l3的距離為3,把一塊含有45°角的直角三角形如圖放置,頂點(diǎn)A,B,C恰好分別落在三條直線上,AC與直線l2交于點(diǎn)D,則線段BD的長(zhǎng)度為A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.4.(2023·河北秦皇島·統(tǒng)考一模)如圖,在SKIPIF1<0中,SKIPIF1<0,點(diǎn)D為線段SKIPIF1<0上一動(dòng)點(diǎn)(不與點(diǎn)B,C重合),連接SKIPIF1<0,作SKIPIF1<0,SKIPIF1<0交線段SKIPIF1<0于點(diǎn)E.下面是某學(xué)習(xí)小組根據(jù)題意得到的結(jié)論:甲同學(xué):SKIPIF1<0;乙同學(xué):若SKIPIF1<0,則SKIPIF1<0;丙同學(xué):當(dāng)SKIPIF1<0時(shí),D為SKIPIF1<0的中點(diǎn).則下列說(shuō)法正確的是(

)A.只有甲同學(xué)正確 B.乙和丙同學(xué)都正確C.甲和丙同學(xué)正確 D.三個(gè)同學(xué)都正確5.(2023秋·河南平頂山·九年級(jí)統(tǒng)考期末)如圖,已知點(diǎn)A,B,C,D,E均在方格紙的格點(diǎn)上,則SKIPIF1<0與SKIPIF1<0的面積比為(

)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<06.(2023·全國(guó)·九年級(jí)專(zhuān)題練習(xí))如圖,在SKIPIF1<0中,SKIPIF1<0,SKIPIF1<0,直線SKIPIF1<0,SKIPIF1<0與SKIPIF1<0之間距離是1,SKIPIF1<0與SKIPIF1<0之間距離是2,且SKIPIF1<0,SKIPIF1<0,SKIPIF1<0分別經(jīng)過(guò)點(diǎn)A,B,C,則邊SKIPIF1<0的長(zhǎng)為()A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<07.(2022·廣東深圳·深圳市大鵬新區(qū)華僑中學(xué)??级#┤鐖D,已知D、E分別是SKIPIF1<0中SKIPIF1<0、SKIPIF1<0邊上的點(diǎn),SKIPIF1<0且SKIPIF1<0,SKIPIF1<0的周長(zhǎng)2,則SKIPIF1<0的周長(zhǎng)為()A.4 B.6 C.8 D.188.(2023秋·安徽六安·九年級(jí)統(tǒng)考期末)如圖,在SKIPIF1<0中,SKIPIF1<0為SKIPIF1<0上一點(diǎn),且SKIPIF1<0,則SKIPIF1<0(

)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<09.(2023·貴州遵義·??家荒#┤鐖D,在SKIPIF1<0中,SKIPIF1<0是SKIPIF1<0邊上的點(diǎn),SKIPIF1<0,SKIPIF1<0,則SKIPIF1<0與SKIPIF1<0的面積比是()A.SKIPIF1<0 B.1:2 C.1:3 D.1:410.(2022秋·四川遂寧·九年級(jí)統(tǒng)考期末)如圖,矩形SKIPIF1<0的四個(gè)頂點(diǎn)分別在直線SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0上,若直線SKIPIF1<0且間距相等,SKIPIF1<0,則SKIPIF1<0的值為(

)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<011.(2020秋·廣西桂林·九年級(jí)校考階段練習(xí))如圖,正方形ABCD中,△SKIPIF1<0繞點(diǎn)A逆時(shí)針轉(zhuǎn)到SKIPIF1<0,SKIPIF1<0,SKIPIF1<0分別交對(duì)角線BD于點(diǎn)E,F(xiàn),若AE=4,則SKIPIF1<0的值為(

)A.8 B.12 C.16 D.2012.(2022秋·九年級(jí)單元測(cè)試)如圖,在平行四邊形ABCD中,E為邊AD的中點(diǎn),連接AC,BE交于點(diǎn)F.若△AEF的面積為2,則△ABC的面積為()A.8 B.10 C.12 D.1413.(2021·江蘇無(wú)錫·九年級(jí)專(zhuān)題練習(xí))如圖,正方形SKIPIF1<0的對(duì)角線SKIPIF1<0、SKIPIF1<0相交于點(diǎn)SKIPIF1<0,SKIPIF1<0是SKIPIF1<0的中點(diǎn),SKIPIF1<0交SKIPIF1<0于點(diǎn)SKIPIF1<0,若SKIPIF1<0,則SKIPIF1<0等于SKIPIF1<0SKIPIF1<0A.3 B.4 C.6 D.814.(2022·浙江·九年級(jí)專(zhuān)題練習(xí))如圖,扇形AOB中,∠AOB=90°.在扇形內(nèi)放一個(gè)Rt△EDF,其中DE=10,DF=9,直角頂點(diǎn)D在半徑OB上,OD=2DB,點(diǎn)E在半徑OA上,點(diǎn)F在弧SKIPIF1<0上.則半徑OA的長(zhǎng)為(

)A.SKIPIF1<0 B.2SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<015.(2020·海南省直轄縣級(jí)單位·統(tǒng)考模擬預(yù)測(cè))如圖,將正方形紙片ABCD沿EF折疊,折痕為EF,點(diǎn)A的對(duì)應(yīng)點(diǎn)是點(diǎn)A′,點(diǎn)B的對(duì)應(yīng)點(diǎn)是點(diǎn)B′,點(diǎn)B′落在邊CD上,若CB′:CD=1:3,且BF=10,則EF的長(zhǎng)為()A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0二、填空題16.(2022秋·黑龍江哈爾濱·九年級(jí)??计谥校┤鐖D,SKIPIF1<0中,點(diǎn)SKIPIF1<0在SKIPIF1<0上,SKIPIF1<0,若SKIPIF1<0,SKIPIF1<0,則線段SKIPIF1<0的長(zhǎng)為_(kāi)__________.17.(2022春·九年級(jí)課時(shí)練習(xí))如圖,在Rt△ABC中,∠ACB=90°,CD⊥AB于點(diǎn)D,已知AD=SKIPIF1<0,那么BC=_______.18.(2020·海南??凇そy(tǒng)考二模)如圖,在SKIPIF1<0中,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,點(diǎn)SKIPIF1<0在SKIPIF1<0邊上,SKIPIF1<0與邊SKIPIF1<0、SKIPIF1<0分別切于點(diǎn)SKIPIF1<0、SKIPIF1<0,則SKIPIF1<0的值為_(kāi)_________.19.(2022秋·江蘇揚(yáng)州·九年級(jí)統(tǒng)考期末)如圖,在邊長(zhǎng)為6的等邊△ABC中,D是邊BC上一點(diǎn),將△ABC沿EF折疊使點(diǎn)A與點(diǎn)D重合,若BD:DE=2:3,則CF=____.20.(2020秋·福建泉州·九年級(jí)福建省南安市僑光中學(xué)??茧A段練習(xí))如圖,SKIPIF1<0是直角三角形,SKIPIF1<0,SKIPIF1<0,點(diǎn)A在反比例函數(shù)SKIPIF1<0的圖象上.若點(diǎn)B在反比例函數(shù)SKIPIF1<0的圖象上,則k的值為_(kāi)_____21.(2019·遼寧沈陽(yáng)·統(tǒng)考中考真題)如圖,正方形ABCD的對(duì)角線AC上有一點(diǎn)E,且CE=4AE,點(diǎn)F在DC的延長(zhǎng)線上,連接EF,過(guò)點(diǎn)E作EG⊥EF,交CB的延長(zhǎng)線于點(diǎn)G,連接GF并延長(zhǎng),交AC的延長(zhǎng)線于點(diǎn)P,若AB=5,CF=2,則線段EP的長(zhǎng)是_____.22.(2019秋·浙江杭州·九年級(jí)期末)如圖,已知SKIPIF1<0和SKIPIF1<0是等邊三角形,連接SKIPIF1<0,連接SKIPIF1<0并延長(zhǎng)交SKIPIF1<0于點(diǎn)SKIPIF1<0,交SKIPIF1<0于點(diǎn)SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,那么SKIPIF1<0的長(zhǎng)為_(kāi)_____.23.(2022·江蘇·九年級(jí)專(zhuān)題練習(xí))如圖,正方形ABCD中,點(diǎn)F是BC邊上一點(diǎn),連接AF,以AF為對(duì)角線作正方形AEFG,邊FG與AC相交于點(diǎn)H,連接DG.以下四個(gè)結(jié)論:①∠EAB=∠BFE=∠DAG;②△ACF∽△ADG;③SKIPIF1<0;④DG⊥AC.其中正確的是_____.(寫(xiě)出所有正確結(jié)論的序號(hào))24.(2021春·全國(guó)·九年級(jí)專(zhuān)題練習(xí))已知正方形DEFG的頂點(diǎn)F在正方形ABCD的一邊AD的延長(zhǎng)線上,連結(jié)AG,CE交于點(diǎn)H,若SKIPIF1<0,SKIPIF1<0,則CH的長(zhǎng)為_(kāi)_______.25.(2023秋·湖北襄陽(yáng)·九年級(jí)統(tǒng)考期末)如圖,在SKIPIF1<0中,SKIPIF1<0,點(diǎn)D在邊SKIPIF1<0上,SKIPIF1<0,則SKIPIF1<0的長(zhǎng)為_(kāi)____.三、解答題26.(2023秋·安徽六安·九年級(jí)??计谀┤鐖D,在SKIPIF1<0中,SKIPIF1<0、SKIPIF1<0分別是SKIPIF1<0、SKIPIF1<0邊上的高.求證:SKIPIF1<0.27.(2022·江蘇·九年級(jí)專(zhuān)題練習(xí))如圖,直線AB經(jīng)過(guò)⊙O上的點(diǎn)C,并且OA=OB,CA=CB,直線OB交⊙O于點(diǎn)E、D,連接EC、CD.(1)試判斷直線AB與⊙O的位置關(guān)系,并加以證明;(2)求證:SKIPIF1<0;(3)若SKIPIF1<0,⊙O的半徑為3,求OA的長(zhǎng).28.(2022秋·北京房山·九年級(jí)統(tǒng)考期中)如圖,AD與BC交于O點(diǎn),SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,求CD的長(zhǎng).29.(2018·湖北武漢·統(tǒng)考一模)如圖,以AD為直徑的⊙O交AB于C點(diǎn),BD的延長(zhǎng)線交⊙O于E點(diǎn),連CE交AD于F點(diǎn),若AC=BC.(1)求證:SKIPIF1<0;(2)若SKIPIF1<0,求tan∠CED的值.30.(2021秋·廣東佛山·九年級(jí)佛山市第十四中學(xué)??茧A段練習(xí))在矩形ABCD中,E為DC邊上一點(diǎn),把SKIPIF1<0沿AE翻折,使點(diǎn)D恰好落在BC邊上的點(diǎn)F.(1)求證:SKIPIF1<0;(2)若AB=2SKIPIF1<0,AD=4,求EC的長(zhǎng).31.(2020·河南商丘·??寄M預(yù)測(cè))如圖,SKIPIF1<0的一邊SKIPIF1<0經(jīng)過(guò)SKIPIF1<0的圓心,另一邊與SKIPIF1<0交于點(diǎn)SKIPIF1<0,作SKIPIF1<0的平分線與SKIPIF1<0交于點(diǎn)SKIPIF1<0,過(guò)點(diǎn)SKIPIF1<0作SKIPIF1<0的切線,交SKIPIF1<0的延長(zhǎng)線于點(diǎn)SKIPIF1<0.(1)求證:SKIPIF1<0(2)若SKIPIF1<0.①若SKIPIF1<0,則SKIPIF1<0的長(zhǎng)為_(kāi)_____;②SKIPIF1<0的最大值為_(kāi)_____.32.(2023·全國(guó)·九年級(jí)專(zhuān)題練習(xí))【問(wèn)題發(fā)現(xiàn)】(1)如圖1,在SKIPIF1<0中,SKIPIF1<0,D為SKIPIF1<0邊上一點(diǎn)(不與點(diǎn)B、C重合)將線段SKIPIF1<0繞點(diǎn)A順時(shí)針旋轉(zhuǎn)90°得到SKIPIF1<0,連接SKIPIF1<0,則線段SKIPIF1<0與SKIPIF1<0的數(shù)量關(guān)系是,位置關(guān)系是;【探究證明】(2)如圖2,在SKIPIF1<0和SKIPIF1<0中,SKIPIF1<0將SKIPIF1<0繞點(diǎn)A旋轉(zhuǎn),當(dāng)點(diǎn)C,D,E在同一直線時(shí),SKIPIF1<0與SKIPIF1<0具有怎樣的位置關(guān)系,并說(shuō)明理由;【拓展延伸】(3)如圖3,在SKIPIF1<0中,SKIPIF1<0,將SKIPIF1<0繞順時(shí)針旋轉(zhuǎn),點(diǎn)C對(duì)應(yīng)點(diǎn)E,設(shè)旋轉(zhuǎn)角SKIPIF1<0為SKIPIF1<0(SKIPIF1<0),當(dāng)點(diǎn)C,D,E在同一直線時(shí),畫(huà)出圖形,并求出線段SKIPIF1<0的長(zhǎng)度.33.(2023·全國(guó)·九年級(jí)專(zhuān)題練習(xí))某校數(shù)學(xué)活動(dòng)小組探究了如下數(shù)學(xué)問(wèn)題:(1)問(wèn)題發(fā)現(xiàn):如圖1,SKIPIF1<0中,SKIPIF1<0,SKIPIF1<0.點(diǎn)P是底邊BC上一點(diǎn),連接AP,以AP為腰作等腰SKIPIF1<0,且SKIPIF1<0,連接CQ、則BP和CQ的數(shù)量關(guān)系是______;(2)變式探究:如圖2,SKIPIF1<0

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