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專題14多邊形與平行四邊形考點(diǎn)1多邊形與平行四邊形一、單選題1.(2023年山西省中考數(shù)學(xué)真題)蜂巢結(jié)構(gòu)精巧,其巢房橫截面的形狀均為正六邊形.如圖是部分巢房的橫截面圖,圖中7個(gè)全等的正六邊形不重疊且無(wú)縫隙,將其放在平面直角坐標(biāo)系中,點(diǎn)SKIPIF1<0均為正六邊形的頂點(diǎn).若點(diǎn)SKIPIF1<0的坐標(biāo)分別為SKIPIF1<0,則點(diǎn)SKIPIF1<0的坐標(biāo)為(

A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<02.(2021·四川德陽(yáng)·統(tǒng)考中考真題)如圖,在菱形ABCD中,對(duì)角線AC,BD相交于點(diǎn)O,點(diǎn)E是CD中點(diǎn),連接OE,則下列結(jié)論中不一定正確的是()A.AB=AD B.OESKIPIF1<0AB C.∠DOE=∠DEO D.∠EOD=∠EDO3.(2023年河北省中考數(shù)學(xué)真題)綜合實(shí)踐課上,嘉嘉畫(huà)出SKIPIF1<0,利用尺規(guī)作圖找一點(diǎn)C,使得四邊形SKIPIF1<0為平行四邊形.圖1~圖3是其作圖過(guò)程.(1)作SKIPIF1<0的垂直平分線交SKIPIF1<0于點(diǎn)O;(2)連接SKIPIF1<0,在SKIPIF1<0的延長(zhǎng)線上截取SKIPIF1<0;

(3)連接SKIPIF1<0,SKIPIF1<0,則四邊形SKIPIF1<0即為所求.

在嘉嘉的作法中,可直接判定四邊形ABCD為平行四邊形的條件是(

)A.兩組對(duì)邊分別平行 B.兩組對(duì)邊分別相等C.對(duì)角線互相平分 D.一組對(duì)邊平行且相等4.(2021·四川德陽(yáng)·統(tǒng)考中考真題)如圖,邊長(zhǎng)為1的正六邊形ABCDEF放置于平面直角坐標(biāo)系中,邊AB在x軸正半軸上,頂點(diǎn)F在y軸正半軸上,將正六邊形ABCDEF繞坐標(biāo)原點(diǎn)O順時(shí)針旋轉(zhuǎn),每次旋轉(zhuǎn)60°,那么經(jīng)過(guò)第2025次旋轉(zhuǎn)后,頂點(diǎn)D的坐標(biāo)為()A.(SKIPIF1<0,SKIPIF1<0) B.(SKIPIF1<0,SKIPIF1<0) C.(SKIPIF1<0,SKIPIF1<0) D.(SKIPIF1<0,SKIPIF1<0)5.(2022·貴州遵義·統(tǒng)考中考真題)如圖,在正方形SKIPIF1<0中,SKIPIF1<0和SKIPIF1<0交于點(diǎn)SKIPIF1<0,過(guò)點(diǎn)SKIPIF1<0的直線SKIPIF1<0交SKIPIF1<0于點(diǎn)SKIPIF1<0(SKIPIF1<0不與SKIPIF1<0,SKIPIF1<0重合),交SKIPIF1<0于點(diǎn)SKIPIF1<0.以點(diǎn)SKIPIF1<0為圓心,SKIPIF1<0為半徑的圓交直線SKIPIF1<0于點(diǎn)SKIPIF1<0,SKIPIF1<0.若SKIPIF1<0,則圖中陰影部分的面積為(

)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<06.(2023·河南周口·河南省淮陽(yáng)中學(xué)校考三模)已知在菱形SKIPIF1<0中,SKIPIF1<0,SKIPIF1<0,則菱形SKIPIF1<0的面積為(

A.SKIPIF1<0 B.126 C.63 D.SKIPIF1<07.(2020·四川巴中·統(tǒng)考中考真題)如圖,在矩形SKIPIF1<0中,SKIPIF1<0,對(duì)角線SKIPIF1<0,SKIPIF1<0交于點(diǎn)SKIPIF1<0,SKIPIF1<0,SKIPIF1<0為SKIPIF1<0上一動(dòng)點(diǎn),SKIPIF1<0于點(diǎn)SKIPIF1<0,SKIPIF1<0于點(diǎn)SKIPIF1<0,分別以SKIPIF1<0,SKIPIF1<0為邊向外作正方形SKIPIF1<0和SKIPIF1<0,面積分別為SKIPIF1<0,SKIPIF1<0.則下列結(jié)論:①SKIPIF1<0;②點(diǎn)SKIPIF1<0在運(yùn)動(dòng)過(guò)程中,SKIPIF1<0的值始終保持不變,為SKIPIF1<0;③SKIPIF1<0的最小值為6;④當(dāng)SKIPIF1<0時(shí),則SKIPIF1<0.其中正確的結(jié)論有(

)A.1個(gè) B.2個(gè) C.3個(gè) D.4個(gè)二、填空題8.(2022·江蘇泰州·統(tǒng)考中考真題)正八邊形一個(gè)外角的大小為度.9.(2021·江蘇鎮(zhèn)江·統(tǒng)考中考真題)如圖,花瓣圖案中的正六邊形ABCDEF的每個(gè)內(nèi)角的度數(shù)是.10.(2023年黑龍江省齊齊哈爾市中考數(shù)學(xué)真題)如圖,在四邊形SKIPIF1<0中,SKIPIF1<0,SKIPIF1<0于點(diǎn)SKIPIF1<0.請(qǐng)?zhí)砑右粋€(gè)條件:,使四邊形SKIPIF1<0成為菱形.

11.(2023年吉林省長(zhǎng)春市中考數(shù)學(xué)真題)如圖,將正五邊形紙片SKIPIF1<0折疊,使點(diǎn)SKIPIF1<0與點(diǎn)SKIPIF1<0重合,折痕為SKIPIF1<0,展開(kāi)后,再將紙片折疊,使邊SKIPIF1<0落在線段SKIPIF1<0上,點(diǎn)SKIPIF1<0的對(duì)應(yīng)點(diǎn)為點(diǎn)SKIPIF1<0,折痕為SKIPIF1<0,則SKIPIF1<0的大小為度.

12.(2023年內(nèi)蒙古包頭市中考數(shù)學(xué)真題)如圖,正方形SKIPIF1<0的邊長(zhǎng)為2,對(duì)角線SKIPIF1<0相交于點(diǎn)SKIPIF1<0,以點(diǎn)SKIPIF1<0為圓心,對(duì)角線SKIPIF1<0的長(zhǎng)為半徑畫(huà)弧,交SKIPIF1<0的延長(zhǎng)線于點(diǎn)SKIPIF1<0,則圖中陰影部分的面積為.

13.(2020·四川阿壩·中考真題)如圖,有一張長(zhǎng)方形片ABCD,SKIPIF1<0,SKIPIF1<0.點(diǎn)E為CD上一點(diǎn),將紙片沿AE折疊,BC的對(duì)應(yīng)邊SKIPIF1<0恰好經(jīng)過(guò)點(diǎn)D,則線段DE的長(zhǎng)為cm.

14.(2020·廣西賀州·統(tǒng)考中考真題)如圖,四邊形ABCD是菱形,對(duì)角線AC,BD相交于點(diǎn)O,SKIPIF1<0,SKIPIF1<0,點(diǎn)P是AC上一動(dòng)點(diǎn),點(diǎn)E是AB的中點(diǎn),則SKIPIF1<0的最小值為.15.(2022·山東臨沂·統(tǒng)考中考真題)如圖,在正六邊形SKIPIF1<0中,SKIPIF1<0,SKIPIF1<0是對(duì)角線SKIPIF1<0上的兩點(diǎn),添加下列條件中的一個(gè):①SKIPIF1<0;②SKIPIF1<0;③SKIPIF1<0;④SKIPIF1<0.能使四邊形SKIPIF1<0是平行四邊形的是(填上所有符合要求的條件的序號(hào)).16.(2023年內(nèi)蒙古包頭市中考數(shù)學(xué)真題)如圖,SKIPIF1<0是正五邊形SKIPIF1<0的對(duì)角線,SKIPIF1<0與SKIPIF1<0相交于點(diǎn)SKIPIF1<0.下列結(jié)論:①SKIPIF1<0平分SKIPIF1<0;

②SKIPIF1<0;

③四邊形SKIPIF1<0是菱形;

④SKIPIF1<0其中正確的結(jié)論是.(填寫(xiě)所有正確結(jié)論的序號(hào))

17.(2023年河北省中考數(shù)學(xué)真題)將三個(gè)相同的六角形螺母并排擺放在桌面上,其俯視圖如圖1,正六邊形邊長(zhǎng)為2且各有一個(gè)頂點(diǎn)在直線l上,兩側(cè)螺母不動(dòng),把中間螺母抽出并重新擺放后,其俯視圖如圖2,其中,中間正六邊形的一邊與直線l平行,有兩邊分別經(jīng)過(guò)兩側(cè)正六邊形的一個(gè)頂點(diǎn).則圖2中(1)SKIPIF1<0度.(2)中間正六邊形的中心到直線l的距離為(結(jié)果保留根號(hào)).

18.(2023·河南周口·河南省淮陽(yáng)中學(xué)校考三模)如圖,在矩形SKIPIF1<0中,SKIPIF1<0,把邊SKIPIF1<0沿對(duì)角線SKIPIF1<0平移,點(diǎn)SKIPIF1<0分別對(duì)應(yīng)點(diǎn)SKIPIF1<0,SKIPIF1<0的最小值為.

三、解答題19.(2019·湖南婁底·中考真題)如圖,點(diǎn)E、F、G、H分別在矩形ABCD的邊AB、BC、CD、DA(不包括端點(diǎn))上運(yùn)動(dòng),且滿足SKIPIF1<0,SKIPIF1<0.(1)求證:SKIPIF1<0;(2)試判斷四邊形EFGH的形狀,并說(shuō)明理由.(3)請(qǐng)?zhí)骄克倪呅蜤FGH的周長(zhǎng)一半與矩形ABCD一條對(duì)角線長(zhǎng)的大小關(guān)系,并說(shuō)明理由.20.(2019·江蘇常州·統(tǒng)考中考真題)【閱讀】:數(shù)學(xué)中,常對(duì)同一個(gè)量(圖形的面積、點(diǎn)的個(gè)數(shù)、三角形的內(nèi)角和等)用兩種不同的方法計(jì)算,從而建立相等關(guān)系,我們把這一思想稱為“算兩次”.“算兩次”也稱做富比尼原理,是一種重要的數(shù)學(xué)思想.【理解】:(1)如圖,兩個(gè)邊長(zhǎng)分別為SKIPIF1<0、SKIPIF1<0、SKIPIF1<0的直角三角形和一個(gè)兩條直角邊都是SKIPIF1<0的直角三角形拼成一個(gè)梯形.用兩種不同的方法計(jì)算梯形的面積,并寫(xiě)出你發(fā)現(xiàn)的結(jié)論;(2)如圖2,SKIPIF1<0行SKIPIF1<0列的棋子排成一個(gè)正方形,用兩種不同的方法計(jì)算棋子的個(gè)數(shù),可得等式:SKIPIF1<0________;【運(yùn)用】:(3)SKIPIF1<0邊形有SKIPIF1<0個(gè)頂點(diǎn),在它的內(nèi)部再畫(huà)SKIPIF1<0個(gè)點(diǎn),以(SKIPIF1<0)個(gè)點(diǎn)為頂點(diǎn),把SKIPIF1<0邊形剪成若干個(gè)三角形,設(shè)最多可以剪得SKIPIF1<0個(gè)這樣的三角形.當(dāng)SKIPIF1<0,SKIPIF1<0時(shí),如圖,最多可以剪得SKIPIF1<0個(gè)這樣的三角形,所以SKIPIF1<0.①當(dāng)SKIPIF1<0,SKIPIF1<0時(shí),如圖,SKIPIF1<0;當(dāng)SKIPIF1<0,SKIPIF1<0時(shí),SKIPIF1<0;②對(duì)于一般的情形,在SKIPIF1<0邊形內(nèi)畫(huà)SKIPIF1<0個(gè)點(diǎn),通過(guò)歸納猜想,可得SKIPIF1<0(用含SKIPIF1<0、SKIPIF1<0的代數(shù)式表示).請(qǐng)對(duì)同一個(gè)量用算兩次的方法說(shuō)明你的猜想成立.21.(2019·廣西玉林·統(tǒng)考中考真題)如圖,在正方形ABCD中,分別過(guò)頂點(diǎn)B,D作SKIPIF1<0交對(duì)角線AC所在直線于E,F(xiàn)點(diǎn),并分別延長(zhǎng)EB,F(xiàn)D到點(diǎn)H,G,使SKIPIF1<0,連接EG,F(xiàn)H.(1)求證:四邊形EHFG是平行四邊形;(2)已知:SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,求四邊形EHFG的周長(zhǎng).22.(2020·廣西賀州·統(tǒng)考中考真題)如圖,已知在△ABC中AB=AC,AD是BC邊上的中線,E,G分別是AC,DC的中點(diǎn),F(xiàn)為DE延長(zhǎng)線上的點(diǎn),∠FCA=∠CEG.(1)求證:AD∥CF;(2)求證:四邊形ADCF是矩形.23.(2023年吉林省長(zhǎng)春市中考數(shù)學(xué)真題)將兩個(gè)完全相同的含有SKIPIF1<0角的直角三角板在同一平面內(nèi)按如圖所示位置擺放.點(diǎn)A,E,B,D依次在同一直線上,連結(jié)SKIPIF1<0、SKIPIF1<0.

(1)求證:四邊形SKIPIF1<0是平行四邊形;(2)已知SKIPIF1<0,當(dāng)四邊形SKIPIF1<0是菱形時(shí).SKIPIF1<0的長(zhǎng)為_(kāi)_________SKIPIF1<0.24.(2023年山西省中考數(shù)學(xué)真題)閱讀與思考:下面是一位同學(xué)的數(shù)學(xué)學(xué)習(xí)筆記,請(qǐng)仔細(xì)閱讀并完成相應(yīng)任務(wù).瓦里尼翁平行四邊形我們知道,如圖1,在四邊形SKIPIF1<0中,點(diǎn)SKIPIF1<0分別是邊SKIPIF1<0,SKIPIF1<0的中點(diǎn),順次連接SKIPIF1<0,得到的四邊形SKIPIF1<0是平行四邊形.

我查閱了許多資料,得知這個(gè)平行四邊形SKIPIF1<0被稱為瓦里尼翁平行四邊形.瓦里尼翁SKIPIF1<0是法國(guó)數(shù)學(xué)家、力學(xué)家.瓦里尼翁平行四邊形與原四邊形關(guān)系密切.

①當(dāng)原四邊形的對(duì)角線滿足一定關(guān)系時(shí),瓦里尼翁平行四邊形可能是菱形、矩形或正方形.②瓦里尼翁平行四邊形的周長(zhǎng)與原四邊形對(duì)角線的長(zhǎng)度也有一定關(guān)系.③瓦里尼翁平行四邊形的面積等于原四邊形面積的一半.此結(jié)論可借助圖1證明如下:證明:如圖2,連接SKIPIF1<0,分別交SKIPIF1<0于點(diǎn)SKIPIF1<0,過(guò)點(diǎn)SKIPIF1<0作SKIPIF1<0于點(diǎn)SKIPIF1<0,交SKIPIF1<0于點(diǎn)SKIPIF1<0.∵SKIPIF1<0分別為SKIPIF1<0的中點(diǎn),∴SKIPIF1<0.(依據(jù)1)

∴SKIPIF1<0.∵SKIPIF1<0,∴SKIPIF1<0.∵四邊形SKIPIF1<0是瓦里尼翁平行四邊形,∴SKIPIF1<0,即SKIPIF1<0.∵SKIPIF1<0,即SKIPIF1<0,∴四邊形SKIPIF1<0是平行四邊形.(依據(jù)2)∴SKIPIF1<0.∵SKIPIF1<0,∴SKIPIF1<0.同理,…任務(wù):(1)填空:材料中的依據(jù)1是指:_____________.依據(jù)2是指:_____________.(2)請(qǐng)用刻度尺、三角板等工具,畫(huà)一個(gè)四邊形SKIPIF1<0及它的瓦里尼翁平行四邊形SKIPIF1<0,使得四邊形SKIPIF1<0為矩形;(要求同時(shí)畫(huà)出四邊形SKIPIF1<0的對(duì)角線)(3)在圖1中,分別連接SKIPIF1<0得到圖3,請(qǐng)猜想瓦里尼翁平行四邊形SKIPIF1<0的周長(zhǎng)與對(duì)角線SKIPIF1<0長(zhǎng)度的關(guān)系,并證明你的結(jié)論.

25.(2023年北京市中考數(shù)學(xué)真題)如圖,在SKIPIF1<0中,點(diǎn)E,F(xiàn)分別在SKIPIF1<0,SKIPIF1<0上,SKIPIF1<0,SKIPIF1<0.

(1)求證:四邊形SKIPIF1<0是矩形;(2)SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,求SKIPIF1<0的長(zhǎng).26.(2020·廣西貴港·中考真題)已知:在矩形SKIPIF1<0中,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0是SKIPIF1<0邊上的一個(gè)動(dòng)點(diǎn),將矩形SKIPIF1<0折疊,使點(diǎn)SKIPIF1<0與點(diǎn)SKIPIF1<0重合,點(diǎn)SKIPIF1<0落在點(diǎn)SKIPIF1<0處,折痕為SKIPIF1<0.(1)如圖1,當(dāng)點(diǎn)SKIPIF1<0與點(diǎn)SKIPIF1<0重合時(shí),則線段SKIPIF1<0_______________,SKIPIF1<0_____________;(2)如圖2,當(dāng)點(diǎn)SKIPIF1<0與點(diǎn)SKIPIF1<0,SKIPIF1<0均不重合時(shí),取SKIPIF1<0的中點(diǎn)SKIPIF1<0,連接并延長(zhǎng)SKIPIF1<0與SKIPIF1<0的延長(zhǎng)線交于點(diǎn)SKIPIF1<0,連接SKIPIF1<0,SKIPIF1<0,SKIPIF1<0.①求證:四邊形SKIPIF1<0是平行四邊形:②當(dāng)SKIPIF1<0時(shí),求四邊形SKIPIF1<0的面積.27.(2021·江蘇鎮(zhèn)江·統(tǒng)考中考真題)如圖1,∠A=∠B=∠C=∠D=∠E=∠F=90°,AB,F(xiàn)E,DC為鉛直方向的邊,AF,ED,BC為水平方向的邊,點(diǎn)E在AB,CD之間,且在AF,BC之間,我們稱這樣的圖形為“L圖形”,記作“L圖形ABC﹣DEF”.若直線將L圖形分成面積相等的兩個(gè)圖形,則稱這樣的直線為該L圖形的面積平分線.【活動(dòng)】小華同學(xué)給出了圖1的面積平分線的一個(gè)作圖方案:如圖2,將這個(gè)L圖形分成矩形AGEF、矩形GBCD,這兩個(gè)矩形的對(duì)稱中心O1,O2所在直線是該L圖形的面積平分線.請(qǐng)用無(wú)刻度的直尺在圖1中作出其他的面積平分線.(作出一種即可,不寫(xiě)作法,保留作圖痕跡)【思考】如圖3,直線O1O2是小華作的面積平分線,它與邊BC,AF分別交于點(diǎn)M,N,過(guò)MN的中點(diǎn)O的直線分別交邊BC,AF于點(diǎn)P,Q,直線PQ(填“是”或“不是”)L圖形ABCDEF的面積平分線.【應(yīng)用】在L圖形ABCDEF形中,已知AB=4,BC=6.(1)如圖4,CD=AF=1.①該L圖形的面積平分線與兩條水平的邊分別相交于點(diǎn)P,Q,求PQ長(zhǎng)的最大值;②該L圖形的面積平分線與邊AB,CD分別相交于點(diǎn)G,H,當(dāng)GH的長(zhǎng)取最小值時(shí),BG的長(zhǎng)為.(2)設(shè)SKIPIF1<0=t(t>0),在所有的與鉛直方向的兩條邊相交的面積平分線中,如果只有與邊AB,CD相交的面積平分線,直接寫(xiě)出t的取值范圍.28.(2022·內(nèi)蒙古赤峰·統(tǒng)考中考真題)同學(xué)們還記得嗎?圖①、圖②是人教版八年級(jí)下冊(cè)教材“實(shí)驗(yàn)與探究”中我們研究過(guò)的兩個(gè)圖形.受這兩個(gè)圖形的啟發(fā),數(shù)學(xué)興趣小組提出了以下三個(gè)問(wèn)題,請(qǐng)你回答:(1)【問(wèn)題一】如圖①,正方形SKIPIF1<0的對(duì)角線相交于點(diǎn)SKIPIF1<0,點(diǎn)SKIPIF1<0又是正方形SKIPIF1<0的一個(gè)頂點(diǎn),SKIPIF1<0交SKIPIF1<0于點(diǎn)SKIPIF1<0,SKIPIF1<0交SKIPIF1<0于點(diǎn)SKIPIF1<0,則SKIPIF1<0與SKIPIF1<0的數(shù)量關(guān)系為_(kāi)________;(2)【問(wèn)題二】受圖①啟發(fā),興趣小組畫(huà)出了圖③:直線SKIPIF1<0、SKIPIF1<0經(jīng)過(guò)正方形SKIPIF1<0的對(duì)稱中心SKIPIF1<0,直線SKIPIF1<0分別與SKIPIF1<0、SKIPIF1<0交于點(diǎn)SKIPIF1<0、SKIPIF1<0,直線SKIPIF1<0分別與SKIPIF1<0、SKIPIF1<0交于點(diǎn)SKIPIF1<0、SKIPIF1<0,且SKIPIF1<0,若正方形SKIPIF1<0邊長(zhǎng)為8,求四邊形SKIPIF1<0的面積;(3)【問(wèn)題三】受圖②啟發(fā),興趣小組畫(huà)出了圖④:正方形SKIPIF1<0的頂點(diǎn)SKIPIF1<0在正方形SKIPIF1<0的邊SKIPIF1<0上,頂點(diǎn)SKIPIF1<0在SKIPIF1<0的延長(zhǎng)線上,且SKIPIF1<0,SKIPIF1<0.在直線SKIPIF1<0上是否存在點(diǎn)SKIPIF1<0,使SKIPIF1<0為直角三角形?若存在,求出SKIPIF1<0的長(zhǎng)度;若不存在,說(shuō)明理由.29.(2023年江蘇省無(wú)錫市中考數(shù)學(xué)真題)如圖,四邊形SKIPIF1<0是邊長(zhǎng)為SKIPIF1<0的菱形,SKIPIF1<0,點(diǎn)SKIPIF1<0為SKIPIF1<0的中點(diǎn),SKIPIF1<0為線段SKIPIF1<0上的動(dòng)點(diǎn),現(xiàn)將四邊形SKIPIF1<0沿SKIPIF1<0翻折得到四邊形SKIPIF1<0.

(1)當(dāng)SKIPIF1<0時(shí),求四邊形SKIPIF1<0的面積;(2)當(dāng)點(diǎn)SKIPIF1<0在線段SKIPIF1<0上移動(dòng)時(shí),設(shè)SKIPIF1<0,四邊形SKIPIF1<0的面積為SKIPIF1<0,求SKIPIF1<0關(guān)于SKIPIF1<0的函數(shù)表達(dá)式.30.(2023·浙江杭州·杭州市豐潭中學(xué)??既#┤绻粋€(gè)多邊形的內(nèi)角和是外角和的3倍,則這個(gè)多邊形的邊數(shù)是()A.6 B.7 C.8 D.931.(2023·浙江杭州·杭州市豐潭中學(xué)??既#┤鐖D,在圓內(nèi)接正六邊形SKIPIF1<0中,SKIPIF1<0分別交SKIPIF1<0于點(diǎn)G,H,若該圓的半徑為12,則線段SKIPIF1<0的長(zhǎng)為(

A.6 B.SKIPIF1<0 C.SKIPIF1<0 D.832.(2023·河南周口·河南省淮陽(yáng)中學(xué)??既#┮阎诹庑蜸KIPIF1<0中,SKIPIF1<0,SKIPIF1<0,則菱形SKIPIF1<0的面積為(

A.SKIPIF1<0 B.126 C.63 D.SKIPIF1<033.(2023·新疆和田·和田市第三中學(xué)校考二模)如圖,在菱形SKIPIF1<0中,分別以SKIPIF1<0、SKIPIF1<0為圓心,大于SKIPIF1<0為半徑畫(huà)弧,兩弧分別交于點(diǎn)SKIPIF1<0、SKIPIF1<0,連接SKIPIF1<0,若直線SKIPIF1<0恰好過(guò)點(diǎn)SKIPIF1<0與邊SKIPIF1<0交于點(diǎn)SKIPIF1<0,連接SKIPIF1<0,則下列結(jié)論錯(cuò)誤的是(

)A.SKIPIF1<0 B.若SKIPIF1<0,則SKIPIF1<0C.SKIPIF1<0 D.SKIPIF1<034.(2023·遼寧·校聯(lián)考三模)如圖,平行四邊形ABCD的對(duì)角線AC、BD相交于點(diǎn)O,AE平分∠BAD,分別交BC、BD于點(diǎn)E、P,連接OE,∠ADC=60°,AB=SKIPIF1<0BC=1,則下列結(jié)論:①∠CAD=30°②BD=SKIPIF1<0③S平行四邊形ABCD=AB?AC④OE=SKIPIF1<0AD⑤S△APO=SKIPIF1<0,正確的個(gè)數(shù)是()A.2 B.3 C.4 D.535.(2023·廣西玉林·統(tǒng)考一模)如圖,在由邊長(zhǎng)相同的7個(gè)正六邊形組成的網(wǎng)格中,點(diǎn)A,B在格點(diǎn)上.再選擇一個(gè)格點(diǎn)C,使△ABC是以AB為腰的等腰三角形,符合點(diǎn)C條件的格點(diǎn)個(gè)數(shù)是()A.1 B.2 C.3 D.436.(2023·河南駐馬店·統(tǒng)考三模)如圖,在平面直角坐標(biāo)系中,點(diǎn)SKIPIF1<0,SKIPIF1<0,點(diǎn)SKIPIF1<0為線段SKIPIF1<0的中點(diǎn),SKIPIF1<0為SKIPIF1<0上一點(diǎn),連接SKIPIF1<0,將SKIPIF1<0沿SKIPIF1<0折疊得到SKIPIF1<0.當(dāng)SKIPIF1<0時(shí),點(diǎn)SKIPIF1<0的坐標(biāo)為(

A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<037.(2023·河北石家莊·石家莊市第四十一中學(xué)??寄M預(yù)測(cè))如圖,正方形的對(duì)角線剛好與正六邊形最長(zhǎng)的對(duì)角線重合,則SKIPIF1<0(

A.10° B.15° C.20° D.25°38.(2023·安徽滁州·??既#┤鐖D,以正方形SKIPIF1<0的對(duì)角線SKIPIF1<0為一邊作菱形SKIPIF1<0,點(diǎn)F在SKIPIF1<0的延長(zhǎng)線上,連接SKIPIF1<0交SKIPIF1<0于點(diǎn)G,則SKIPIF1<0.39.(2023·河北石家莊·石家莊市第四十一中學(xué)校考模擬預(yù)測(cè))圖1、圖2的兩個(gè)正方形網(wǎng)格的面積分別為SKIPIF1<0、SKIPIF1<0,正方形SKIPIF1<0、SKIPIF1<0滿足SKIPIF1<0,下列結(jié)論正確的是(

A.SKIPIF1<0 B.SKIPIF1<0C.SKIPIF1<0 D.SKIPIF1<040.(2023·河南洛陽(yáng)·統(tǒng)考三模)如圖,已知四邊形SKIPIF1<0是平行四邊形,下列三個(gè)結(jié)論:①當(dāng)SKIPIF1<0時(shí),它是菱形,②當(dāng)SKIPIF1<0時(shí),它是矩形,③當(dāng)SKIPIF1<0時(shí),它是正方形.其中結(jié)論正確的有(

)A.0個(gè) B.1個(gè) C.2個(gè) D.3個(gè)41.(2023·重慶沙坪壩·重慶南開(kāi)中學(xué)??级#┮阎粋€(gè)正多邊形的一個(gè)外角為SKIPIF1<0,則這個(gè)正多邊形的邊數(shù)是.42.(2023·云南麗江·統(tǒng)考二模)一個(gè)正多邊形的每個(gè)外角為60°,那么這個(gè)正多邊形的內(nèi)角和是.43.(2023·遼寧本溪·統(tǒng)考二模)如圖,一正六邊形SKIPIF1<0的對(duì)角線SKIPIF1<0的長(zhǎng)為SKIPIF1<0,則正六邊形SKIPIF1<0的邊長(zhǎng)為.

44.(2023·山東濟(jì)南·統(tǒng)考三模)將正六邊形與正方形按如圖所示擺放,公共頂點(diǎn)為SKIPIF1<0,且正六邊形的邊SKIPIF1<0與正方形的邊SKIPIF1<0在同一條直線上,則SKIPIF1<0的度數(shù)是.

45.(2023·山東濟(jì)南·統(tǒng)考三模)公元三世紀(jì),我國(guó)漢代數(shù)學(xué)家趙爽在注解《周髀算經(jīng)》題時(shí)給出了“趙爽弦圖”.將兩個(gè)“趙爽弦圖”(如圖1)中的兩個(gè)正方形和八個(gè)直角三角形按圖2方式擺放圍成正方形SKIPIF1<0,記空隙處正方形SKIPIF1<0,正方形SKIPIF1<0的面積分別為SKIPIF1<0,SKIPIF1<0,則下列四個(gè)判斷:①SKIPIF1<0②SKIPIF1<0;③若SKIPIF1<0,則SKIPIF1<0;④若點(diǎn)A是線段SKIPIF1<0的中點(diǎn),則SKIPIF1<0,其中正確的序號(hào)是

46.(2023·山東濟(jì)寧·濟(jì)寧學(xué)院附屬中學(xué)??既#┤鐖D,從一個(gè)邊長(zhǎng)為SKIPIF1<0的鐵皮正六邊形SKIPIF1<0上,剪出一個(gè)扇形SKIPIF1<0.若將剪下來(lái)的扇形SKIPIF1<0圍成一個(gè)圓錐,則該圓錐的底面半徑為.47.(2023·河南周口·河南省淮陽(yáng)中學(xué)??既#┤鐖D,在矩形SKIPIF1<0中,SKIPIF1<0,把邊SKIPIF1<0沿對(duì)角線SKIPIF1<0平移,點(diǎn)SKIPIF1<0分別對(duì)應(yīng)點(diǎn)SKIPIF1<0,SKIPIF1<0的最小值為.

48.(2023·浙江杭州·校考二模)如圖所示的五邊形花環(huán)是用五個(gè)全等的等腰三角形拼成的,則∠BAC的度數(shù)為.49.(2023·江蘇鹽城·景山中學(xué)??既#┤鐖D,在矩形ABCD中,AB=13,BC=17,點(diǎn)E是線段AD上一個(gè)動(dòng)點(diǎn),把△BAE沿BE向矩形內(nèi)部折疊,當(dāng)點(diǎn)A的對(duì)應(yīng)點(diǎn)A1恰好落在∠BCD的平分線上時(shí),AE的長(zhǎng)為.50.(2023·河南洛陽(yáng)·統(tǒng)考三模)如圖,將矩形紙片SKIPIF1<0折疊,折痕為SKIPIF1<0,點(diǎn)SKIPIF1<0,SKIPIF1<0分別在邊SKIPIF1<0,SKIPIF1<0上,點(diǎn)SKIPIF1<0,SKIPIF1<0的對(duì)應(yīng)點(diǎn)分別在SKIPIF1<0,SKIPIF1<0,且點(diǎn)SKIPIF1<0在矩形內(nèi)部,SKIPIF1<0的延長(zhǎng)線交邊SKIPIF1<0于點(diǎn)SKIPIF1<0,SKIPIF1<0交邊SKIPIF1<0于點(diǎn)SKIPIF1<0.SKIPIF1<0,SKIPIF1<0,當(dāng)點(diǎn)SKIPIF1<0為SKIPIF1<0三等分點(diǎn)時(shí),SKIPIF1<0的長(zhǎng)為.

51.(2023·福建福州·校考二模)如圖,在平行四邊形SKIPIF1<0中,E為SKIPIF1<0的中點(diǎn),連接SKIPIF1<0并延長(zhǎng)交SKIPIF1<0的延長(zhǎng)線于點(diǎn)F,連接SKIPIF1<0,且SKIPIF1<0.判斷四邊形SKIPIF1<0的形狀并證明;52.(2023·山東濟(jì)寧·濟(jì)寧學(xué)院附屬中學(xué)??既#┒x:長(zhǎng)寬比為SKIPIF1<0:1(n為正整數(shù))的矩形稱為SKIPIF1<0矩形.下面,我們通過(guò)折疊的方式折出一個(gè)SKIPIF1<0矩形,如圖①所示.操作1:將正方形SKIPIF1<0沿過(guò)點(diǎn)B的直線折疊,使折疊后的點(diǎn)C落在對(duì)角線SKIPIF1<0上的點(diǎn)G處,折痕為SKIPIF1<0.操作2:將SKIPIF1<0沿過(guò)點(diǎn)G的直線折疊,使點(diǎn)A,點(diǎn)D分別落在邊SKIPIF1<0,SKIPIF1<0上,折痕為SKIPIF1<0,則四邊形SKIPIF1<0為SKIPIF1<0矩形.設(shè)正方形SKIPIF1<0的邊長(zhǎng)為1,則SKIPIF1<0.由折疊性質(zhì)可知SKIPIF1<0,SKIPIF1<0,則四邊形SKIP

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