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

15 pls—i need a 2 column proof. thanks xx-example-1
User Sgi
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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).
User Anne Quinn
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