Choose the correct statements out of ①②③④ if lines
and
are parallel.
①∠1=∠5 ②∠1=∠7 ③∠2=∠3 ④∠4=∠7
A ① & ②
B ① & ③
C ① & ④
D ③ & ④
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A: 1&5 are corresponding angles, and 5&7 are vertical angles, so A is correct.