2017-2018 CGS2017-2018 DBDAB ADBDC 11 (3 2) 12 13 5 14 15 8 16. 17 1 2 4 18 1 2 3 3 19. AD ABC DAE= 8 20. AB=AC ABC= ACB A B ED ABD= DBC= ABC 21. 3 22. 1 OD=OC CE=DE OE=OE COE DOE AOE= BOE OE AOB 2 OM=ON OP=OP OMP= Rt OMP Rt ONP HL MOP= NOP OP 23 1 BE CE AD CE E= ADC= BCE+ ACD+ CAD= BCE 3 ADC CEB ADC CEB AAS 6 2 ADC CEB AD=6cm CE=AD=6cm BE=CD DE=4cm BE=CD=CE DE=6cm 4cm=2cm 11 1 6 2t cm 1 2 t=1 BP=CQ=2 1=2 AB=8 D AB BD=4 PC=BC BP BC=6 PC=6 2=4 PC=BD AB=AC B= C BPD CQP BPD CQP SAS vP vQ BP CQ BPD CPQ B= C BP=PC=3cm CQ=BD=4cm P Q t= = VQ= = = /
