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Mathematics 9 Online
OpenStudy (anonymous):

1. line RS || segment AB, ∠1=∠2 If lines ||, alternate interior ∠'s = 2. ∠B = ∠1 If two ∠'s of a triangle are =, sides opposite are = 3. ∠A = ∠2 Substitution 4. ∠A = ∠B Given 5. RA = RB If lines ||, corresponding ∠'s are =

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