123OABOAAB4=21,._____________________________________________2DABAC6cmCD4cmAB12cm3792x216xx_____.4230255________________________56ABABCBC2ABDABBD3cmAC7OADAOBBOCCOD25_____________.8ABCAB=5cmBC=3cmDACDB__________cm9ABAC2B2C________101,n1ABCDEF21AOBO3A.AOB2AOCOCAOBB.AOBOCC.OCODAOBAOCDOCD.OCAOBAOCBOC4AOBBOCCODDOE30A10B4C3D65nnA6B7C8D967AB10cmACBC12cmCABABBAABA0B1C2D38MNMNPQMP2NPMQ2MNMPNQA31B32C21D239,.ABCBCD.ABCDNM1NMPDCBAB()DCADCBAAEDBFC1+2+3=90,123..A.1B.2C.3D.410ABCD45ACBD145AMAN,BDACPMAN45A.B.C.D.1AOB90oAOC60oODBOCOEAOCDOE2MABAB32BCNBDBC2CDAB2cmADAN.3,AD=12DB,EBC,BE=15AC=2cm,DE.4OABOCODBOCOEAOC.1AODBOE2BOC=68CODEOC3CODEOC5AOB=COD=90OCAOBBOD=3DOECOE6OADAOCAOBOMONAOCAOB40MONAOCAOB7OACOBODAOBOEBOCBOE12EOCDOE7012AODEOC8ABCDBD=13AB=14CDABCDEF10cmABCDOACBEDABCDE