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Ravi says: 'If two angles are complementary, each must be acute.' Is his statement correct, and why?

Class 9Pairs of AnglesGeometry — Lines and Angles
  • ACorrect, because each is less than 90°
  • BWrong, one could be 90°
  • CWrong, one could be obtuse
  • DCorrect, because they sum to 180°

Step-by-Step Solution

Since the two positive angles sum to 90°, neither can reach 90°, so each is strictly less than 90°, i.e. acute.
Answer: A) Correct, because each is less than 90°

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