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A transversal cuts two parallel lines. If one interior angle is 65°, what is the measure of the co-interior (same-side) angle?

Competition practiceGeometry
  • A25°
  • B65°
  • C115°
  • D125°

Step-by-Step Solution

Co-interior angles between parallel lines are supplementary, so the angle is 180° − 65° = 115°.
Answer: C) 115°

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