15 pls—i need a 2 column proof. thanks xx

Mathematics

1 answer:

marusya05 [52]3 years ago

7 0

I haven't done proofs in a while, but one thing that might help is that only if two lines were parallel would angles 3 and 1 be congruent (3 is congruent to 2, which is congruent to 1, so they're all congruent to each other).

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Required: