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1 Full revolution = 360 ° 

                                     Degree

 

We measure angles in term of degrees.

  1 revolution = 360 °

  1/2 revolution = (360°)/2 = 180°

 

  1/4 revolution = (360°)/4 = 90°

So,

  Right angle =  1/4 revolution = 90°

  Straight angle = 1/2 revolution = 180°

 

Acute Angle

Acute angle is less that right angle.

∴        Acute angle < Right Angle.

          Acute angle < 90°

 

Obtuse Angle

Obtuse angle is greater than right angle, but smaller than straight angle.

Right angle < Obtuse angle < Straight angle.

90° < Obtuse angle < 180°

 

Reflex Angle

Reflex angle is an angle greater than straight angle.

  Reflex angle > Straight angle

  Reflex angle > 180°

 

To summarize,

  Right angle = 90°

   Straight = 180°

  Acute angle < 90°

  Obtuse angle > 90° & Obtuse angle < 180°

  Reflex angle > 180°

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Davneet Singh

Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 12 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.