Alternate Interior Angles

Last updated at August 14, 2026 by

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Alternate interior angles are

  • Between lines i.e interior
  • In the opposite side of transversal i.e alternate

∠3 & ∠6 are alternate interior angles 

∠4 & ∠5 are alternate interior angles 

 

For parallel lines,

 

Alternate interior angles are equal.

  ∠3 = ∠6

      & ∠4 = ∠5

Alternate Interior Angles - Part 2

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