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March List I with List II :   List I   List II (A) Supplementary angles (I) Angles less than 90° (B) Complementary angles (II) Two angles whose sum is 180° (C) Acute angles (III) Angles greater than 90° but less than 180° (D) Obtuse angles (IV) Two angles whose sum is 90° Choose the correct answer from the options given below :

March List I with List II :   List I   List II (A) Supplementary angles (I) Angles less than 90° (B) Complementary angles (II) Two angles whose sum is 180° (C) Acute angles (III) Angles greater than 90° but less than 180° (D) Obtuse angles (IV) Two angles whose sum is 90° Choose the correct answer from the options given below : Correct Answer <span style="">(A) - (II), (B) - (IV), (C) - (I), (D) - (III)</span>

In Euclidean geometry, an angle is the figure formed by two rays, called the sides of the angle, sharing a common endpoint, called the vertex of the angle. 

Key PointsThe following table shows the definition and significance of the mentioned types of angles,

 Types of angle Description
Supplementary Angles
  • When the sum of two angles is equal to 180°, they are called supplementary angles.
  • The two angles when added make up 180°.
  • For example, 110° and 70° make up 180°. So these two angles are said to be supplementary.
  • Here, one angle is the supplement of another angle.
  • For example, the supplement of 60° is (180° - 60°), which is 120°.
Complementary Angles
  • When the sum of two angles is equal to 90°, they are called complementary angles.
  • The two angles can be of any measure such that they sum up to 90°.
  • For example, the two angles can be 30° and 60°.
  • Here, one angle is the complement of the other angle.
Acute Angles
  • Any angle that is less than 90° is an acute angle.
  • If two rays intersect at a vertex, forming an angle that is less than 90°, an acute angle is formed.
  • Some examples of acute angle are 20°,30°,45°,60°. 
Obtuse Angles
  • Any angle that is greater than 90° but less than 180° is an obtuse angle.
  • The angle formed by the rays PQ and QR in the figure is an obtuse angle.
  • Some examples of obtuse angles are 110°, 130°, 145°,165°.

Hence, the correct answer is (A) - (II), (B) - (IV), (C) - (I), (D) - (III)

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