ʱ : 2020年九年级数学中考三轮冲刺复习:《四边形综合训练?含解? - 百度文库ϿʼĶ
1֤ͼ1OCϽȡOKOEEK
OCOACOABA090㣬OEKOKE45㣬 APΪOCBAƽߣ BAP45㣬
EKCPAE135㣬 CKEA ECEP
CEFCOE90㣬
CEO+KCE90㣬CEO+PEA90㣬 KCECEA ڡCKE͡EAPУ
CKEաEAPASA ECEP
2ٽ⣺yϴڵMʹıBMEPƽıΣͼ2BBMPEyڵMBPEM
5
CQBCEP90㣬 ԡOCECBQ ڡBCM͡COEУ
BCMաCOEASA BMCE CEEP BMEP BMEP
ıBMEPƽıΣ ߡBCMաCOE CMOE3 OMCOCM2 ʵMΪ02
ͼ3ڵQʹıCEPQΣ
QQHyڵQQHCCOE90㣬HQC+HCQ90㣬
6
ߡQCE90㣬 HCQ+ECO90㣬 ECOCHQ ıCEPQΣ CQEC
HCQաOECAAS HCOE2HQOC5 HO7
QΪ57
4ͼABCDУEΪBC㣬AFƽ֡EADCDڵF 1ͼ1FǡΪCDе㣬֤AEBE+2CE 2ڣ1£
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3ͼ2ӳAFBCӳڵGӳAEDCӳڵHHGCGDFʱ֤HGAG
⣺1ͼ1ӳBCAFӳڵG
ADCG
7
DAFG ֡AFƽ֡DAE DAFEAF GEAF EAEG
ߵFΪCDе㣬 CFDF
֡ߡDFACFGFADG ADFաGCFAAS ADCG CGBCBE+CE
EGBE+CE+CEBE2CEAE
2CEaBEbAE2a+bABa+b
RtABEУAB2+BE2AE2a+b2+b22a+b2b3abaᣩ ࣽ
3ͼ2DG
CGDFDCDAADFDCG ADFաDCGSAS CDGDAF HAFFDG
8