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(iii) Obtuse angle: An obtuse angle is an angle which is more than 90° and less
than 180°.
Obtuse angle : 90° < z < 180°
(iv) Straight angle: A straight angle is an angle which is equal to 180°.
Straight angle : s = 180°
(v) Reflex angle: A reflex angle is an angle, which is more than 180° and less than
360°.
Reflex angle : 180° < t < 360°
Complementary Angles:
Two angles are called complementary angles, if the sum of the two angles is one
right angle i.e. 90°.
Each angle is called the complement of the other.
Example:
20° and 70° are complementary angles, because 20° + 70° = 90°.
