In ΔABC and Δ DEF, it is given that 
then
With the ratio given, we can observe that Δ ABC 
Δ EDF,
∠ A = ∠E,
∠ B = ∠D,
∠ C = ∠ F
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In ΔABC and Δ DEF, it is given that then
With the ratio given, we can observe that Δ ABC Δ EDF,
∠ A = ∠E,
∠ B = ∠D,
∠ C = ∠ F