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Two parallel lines are cut by a transversal. One pair of co-interior (same-side interior) angles is given.
If one co-interior angle is 108°, what is the measure of the other co-interior angle?

Class 9Geometrical Terms and DefinitionsGeometry — Foundations
  • A79
  • B65
  • C72
  • D144

Step-by-Step Solution

Co-interior angles between parallel lines are supplementary, summing to 180°. The other angle = 180 - 108 = 72°.
Answer: C) 72

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