Fundamental Ideas
Parallel Lines
Postulate 11 (Parallel Postulate): If two parallel lines are cut by a transversal, then the corresponding angles are equal (Figure
1 ).
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This postulate says that if l // m, then
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m ∠1 = m ∠5
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m ∠2 = m ∠6
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m ∠3 = m ∠7
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m ∠4 = m ∠8
