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AG/AF = GB/CF
AG/9 = 4/3
AG = 4/3 x 9 = 12
2)
EF/CD = AF/AC
EF /10 = 9/(9+3)
EF = 10 (9/12)= 90/12
AG/BG = AF/FC
AG/4 = 9/3
AG = 4.9/3
AG = 12 cm
2)
AF/AC = EF/CD
9/12 = EF/10
EF = 9. 10/12
EF = 7,5 cm