Answer:
B'C' = 16.2 and AB = 2.8
Explanation:
the scale factor is 3 , then sides of Δ A'B'C' are 3 times Δ ABC
B'C' = 3 × BC = 3 × 5.4 = 16.2 units
Then
the sides of Δ ABC are
times Δ A'B'C'
AB = A'B' ÷ 3 = 8.2 ÷ 3 ≈ 2.7 units ( to the nearest tenth )