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Two angles whose sum is 180° but which do not share a common arm are called:

Class 9Pairs of AnglesGeometry — Lines and Angles
  • ASupplementary angles
  • BLinear pair
  • CAdjacent angles
  • DVertically opposite angles

Step-by-Step Solution

Any two angles adding to 180° are supplementary; a linear pair additionally requires them to be adjacent on a straight line.
Answer: A) Supplementary angles

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