State the property that is used each of the following statements?

CBSE Class 7 CBSE Class 7 Maths
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State the property that is used each of the following statements ?

  1. If a || b, then ∠ 1 = ∠ 5.
  2. If ∠ 4 = ∠ 6, then a || b.
  3. If ∠ 4 + ∠ 5 = 180°, then a || b.
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