a) In ΔABC , in care E ∈ (AB) , F ∈ (AC) , EF || BC . <AEF ≡ . . . . . b) In ΔABC , in care E ∈ (AB) , F ∈ (AC) , EF || BC . <AFE ≡ . . . . . c) In ΔABC , in care D ∈ (BD) , F ∈ (AC) , FD || AB <FDC ≡ . . . . . d) In ΔABC , in care D ∈ (BD) , F ∈ (AC) , FD || AB . <BAC ≡ . . . . .