如何理解圆心角与圆周角的关系为60度,设圆心角与圆周角的关系为x这三者之间的关系。 这里的为就是等于的

圆周角和圆心角的关系
2P101& ABC=AOC123
3P102& ABC1OABCBDABDCBD=AODCODABC=AOC
2OABCBDABDCBD=AODCODABC=AOC
4P104& 1ABCADCAECAOC
23-18BOC=180BAC=90
323-19OBOCBAC=90BOC=180BOCBCO
O=CCOOAEBCCO
3-3-4AB=OAOABAOB=60C=30AB6030
RtABCAB=2AC=cosCAB==CAB=45
RtADBAD=1AB=2cosDAB==DAB=60
CAD=DABCAB=105
CDACB=AD=BD
RtADBAD=BD=AB=5cm
2& 200210O1O2ABO1O2CAO2BBCO2DACAD&&&&&&&&&&&&&&&&&&&&&&&&&&&&
13-3-9a3-3-9aACCDAD
ACO1O2EO1CO2CCE2=O1O2EO2
1AC=CD=AD2AO1O2DACD603O1O2CCO2EO2C2=O1O2EO2O2C=CE
AO2BO2AO1O1O2
O1O2O1O2AO2=O1O2=AO1AO2O1=60
AO2B=120D=AO2B=120=60
ACB=AO2B=120ACD=60ACD
3CCO1O2=30
ACO2=30CO1O2=ACO2
O1O2C=CO2EO1O2CCO2E
O2C2=O1O2O2EO1O2=O1CO1O2C=O1CO2=CEO2
CO2=CECE2=O1O2EO2
3& 2003123-3-10ABOACODBCACDBC=4cm
32sinA1=0O
32sinA1=0sinA=A=30RtABCA=30BC=ABAB=2BC=8cmO8cm
4& 200333-3-11ABOCDEO12=&&&& &&&&&&&&&&&&&
12=ADADB90ADB=12
EOEOAEOBEOAEOB=18012=90
RtEDBBD==BD
8& 3-3-16ABOABOOCACACBCBC=AB2
13-3-17POAPACBPBD=AB2
23-3-18ACBDPAB2=&&&&&&& 1
APACBPBD=ABAEBE=AB2
2AB2=ACAPBDBPPPEABEBCAD
ACB=AEPCAB=EAPACBAEP
AEAB=ACAPBDABEPBEAB=BPBD
AEABBEAB=ACAPBPBDABAEBE=ACAPBPBD
AB2=ACAPBPBD
1ADBCPADPBCAPACBPBDABABDPPEABEBEPBDAAPEABC
=A=25BOD=&&&&&&&&&&&&&&&&&
83-3-25ABCOBACAMBCDOMBAC=60ABC=50CBM=&&&&&&&&&&&&&&&&&& AMB=&&&&&&&&&&&&&&&&&&
9OAB2cmcm&&&&&&
103-3-26OABBCAB=6BC=8O
15ABCOODBCDBC=2OD=1BAC
163-3-31AOB
173-3-32OADBCEBAD=CAD=sin=cos=AC=21EC2AD
213-3-36PQBCBP=CQABCABAP=CAQABC
222002123-3-37BCODABCDACBDE
2BC=CD=sinAEB
BAC&&&&&&&&&&&
13-3-39POABCAPBCDPBPCx2PAxPAPD=0
1DE=EF=FA=1ABCDEF
3RtABCABC=90A=50
16ACBBCECEDBDEACECBD&
230& ABOAOB
2D& 1=32=45=67=8=1=41=24=32=38
5130& BOD=2BCD=225=50AOD=180BOD=18050=130
ONAB=M=3060AON=60
750& COA=25COB=2A=50=BOD=COB=50
83070& ABCC=70AMB=ACB=70CBM=CAM=30
10ACABBCABC=90ACORtABCAB2BC2=AC2AC=10O5
11ABAGB=90
AEDFEGEFDE=AEEG
12CD=14& BCAODACBCD==14
13ADAB=ACABC
ADBACBAD=CADBD=DE
1560120& OO
16P=30OBA=P=30B02OB=2
RtBOAAO=BOtan30=AB===
SABO=OAOB=2=S=AB2=3=
171RtAECcos=AC=2AE=ACcos=2=
EC==EC=ACsin=
2RtABEAE=sin=
sin==BE=3kAB=5k
25k29k2=2k=BE=3k=
BDD=CDBE=BDEACE
AEED=EBECED=ED=AD=AEED=
ABDAEB=AB2=ADAE
ABEADB=AB2=ADAE
CCACBCAFFB
2DADEDBEBE=ABDEADB
12ABABABAB
21BAP=CAQABC
3-3-2ABCAPAQDEDBCEBAP=CAQ
BD=CECBD=BCEBP=CQ
BPDCQED=EAB=AC
BCOBAC=BDC=90ABEDBC
2ABEDBCAEB=DCB
RtBDCBC=CD=BD==
sinAEB=sinDCB===
3ABD=DBC=CADADE=BDAAEDBAD
CD=AD=CD2=DEDB=BDBEDB
RtABEAB=BEsinAEB==
23BEBEACBE2=AB2AE2=8222=60
FC=xBF=5xBC=6x
EFBCEBF=CBEBEFBCEBE2=BFBC60=5x6x
FC0x=BC=6x=6EC2=BC2BE2=7260=12EC=2
APCBFCPA=FB=BPPF=BPPC&
ABPCDPPCD=PABDPC=BPA=60
CDPABPPBPC=PAPD&
PBPCx2PAxPAPD=0
1PBPC=PA2PBPC=PAPD
23-3-6OAOBOCODOEOF
SBOC= SCOD SDOE= SEOF=
1AF=BC=DE=1
BOF=FOD=DOB=120
BAF=FED=DCB=120
AFE=EDC=CBA=120
ABCDEFS=SMNP3SPAF
SMNP =323SPAF=312
ABCDEF=ABCDEF=}

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