Answer:
A. 45°
Explanation:
m<ECD = 75° (given)
m<BCD = m<GCF = 60° (vertical angles & given)
m<ECD + m<BCD + m<BCA = 180°
75° + 60° + m<BCA = 180°
m<BCA = 45°
AB = BC
m<BAC = m<BCA
m<BAC = 45°
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