... *>(?−>(?4'(,A,(?9:!&P:0*>(?−>(?*>(?−>(?4<⇔'(,A,(4<⇔(>'(A,?4<⇔(4<6(4−,V'RW!&P:0*>(?−>(?7(4<6(4−,V'+< ,- < ,- < - < - < ,- < ,- < ,- < ,- ./D, C493 Hình vẽChøng minh : AKB = AKC .XY:AKB $ ... %9:(.!9$;)*+5<<<+5,<<+=<<+5'<<./"%&./01&2,(>'(5?@(>(A5?>'8(?7)*+5@('+'+5@(+8)012%,6điểm3./4%>, - &2:?&*>(?4'('B'(A,(,B,('AC(A,$>(?4 -( '−@(,AC(B-(BC('A -( ,A,?DE!F$GH(IHJ7KL!&M:"N01&I1?O*>(?A>(?6*>(?−>(??9:!&P:0*>(?−>(?./5 ... Z)Q4Q>Q.!&2:B!?*Q)!*4*>*#&*B!?RW) AKB = AKC (c−c−c).< - < - < - 1!:&)Q34Q+XY*Q3$*QZ)?=<><=∠=∠ NMKANKAM∠=∠>*Q7.!I[K!7H!&?*Q)![*Q34*Q>#\B!ZF?].)Q34Q< - < - 3Q*!:&)Q4S#Q^⊥>^∈?6_&Q+Z)^Q4Q>#\B!ZF?].)^4Q:)^4QZ)4,QRW)Q4S+< - < - Chú...