OpenOlympiad
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Concept 3 of 8Foundation
Video

Types of angles

  • Acute: between 0° and 90° (narrow).
  • Right: exactly 90° (makes an L).
  • Obtuse: between 90° and 180°.
  • Straight: exactly 180° (flat line).
  • Reflex: between 180° and 360° (more than a half-turn).
  • Complete: exactly 360° (full turn).
Example
Open a book fully flat — the cover makes a straight angle (180°).
AcuteRightObtuseStraightReflex
💡 Tip:Acute = 'adorable' (small). Obtuse = 'obese' (wide). Silly but sticks!
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5 questions to check what you just read.

0 / 5
  1. Q1.An angle of 60° is:
  2. Q2.An angle of 135° is:
  3. Q3.A straight angle is:
  4. Q4.An angle of 210° is:
  5. Q5.A right angle makes this shape: