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Meera measures one interior angle on a side of a transversal to be 78°. For the two lines to be parallel, what must be the measure of the other co-interior angle on the same side?

Class 9The Fifth PostulateGeometry — Foundations
  • A112
  • B102
  • C92
  • D204

Step-by-Step Solution

For parallel lines the two co-interior angles sum to 180°. So the other = 180 - 78 = 102°.
Answer: B) 102

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