2021-2022学年江西省全南中考数学五模试卷含解析及点睛

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ᵫ(2)᧕NCAK=NEGK=NEKG=NAKC,CK=AC=5a,ᵫHK=a,AH3AHtanZAKH=--=3,AK=^0a,ᔠAK=Jj஺)AC=5ᙠBGKHᵫNBHK=NBKG=90஺,HKANABG+NHKG=180஺ᔠNAKH+NGKG=180஺ZACG=ZABGNACG=NAKH,

16_4PNPNᙠRtAAPN\ᵫtanZCAH=—=-----,1×PN=12b,AP=9b,ᵫtanZACG=------=tanNAKH=31CP=4b,3APCPᵫ°1AC=AP+CP=13Z?=5,ᑣ1b=—,ᵫ°ᓽ1ᙠRtACPN\ᵫîïQᳮdCNḄñ.13c⚪᪆:(1)᝞/1,óôOG.YEFᑗGO@G,AOG±EF,AZAGO+ZAGE=90°,•CD_LAB@H,/.ZAHD=90°,AZOAG=ZAKH=90°,VOA=OG,AZAGO=ZOAG,.\ZAGE=ZAKH,VZEKG=ZAKH,AZEKG=ZAGE,/.KE=GE.(2)×NFGB=a,•AB!öAZAGB=90°,:.NAGE÷=NEKG=90஺-a,ZE=180°-ZAGE-ZEKG=2a,VZFGB=-ZACH,2/•ZACH=2a,AZACH=ZE,ACA/7FE.(3)øNPJLAC@P.

17VZACH=ZE,/“AH3”..sinZE=sinZACH=------=—,×AH=3a,AC=5a,AC5___________CH4ùuCH=4AC2-CH2=4atanZCAH=——=-AH3VCA/7FE,/.ZCAK=ZAGE,VZAGE=ZAKH,AZCAK=ZAKH,AH_____AAC=CK=5a,HK=CK-CH=4a,tanZAKH=——=3,AK=AH2HK2=\[\0tHK•AK=L•••Ma=Vioa=l.AC=5,VZBHD=ZAGB=90°,:.ZBHD+ZAGB=180°,ᙠúOBGKH\ZBHD+ZHKG+ZAGB+ZABG=360°,AZABG+ZHKG=180c,VZAKH+ZHKG=180°,AZAKH=ZABG,VZACN=ZABG,/.ZAKH=ZACN,AtanZAKH=tanZACN=3,•NPJ_AC@P,AZAPN=ZCPN=90°,PN4ᙠRtAAPN\tanZCAH=——=-,×PN=12b,ᑣAP=9b,AP3PNᙠRtACPN\tanZACN=——=3,CPACP=4b,AAC=AP+CP=13b,VAC=5,A13b=5,

18