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Question

Which angles in the following figure are acute ?


  1. 1, 2, 3 and 4
  2. 1 and  2
  3. 2 and 4
  4. 1 and 3


Solution

The correct option is D 1 and 3
In the given figure, angles 1 and 3 are less than 90°, and hence are acute angles. Angles 2 and 4 are greater than 90° and less than 180°, and hence are obtuse angles.

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