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Which of the following is NOT always true?

Class 7Pairs of AnglesLines and Angles
  • AAdjacent angles are complementary
  • BVertically opposite angles are equal
  • CA linear pair is supplementary
  • DTwo right angles form a linear pair

Step-by-Step Solution

Adjacent angles share a vertex and arm but need not add to 90°, so they are not always complementary. The other statements are always true.
Answer: A) Adjacent angles are complementary

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