Maths Revision



  • An angle less than 90 is called an acute angle.
  • An angle of 90 is called a right angle.
  • An angle between 90 and and 180 is called an obtuse angle.
  • An angle of 180 is called a straight angle.
  • An angle between 180 and 360 is called a reflex angle.
  • Angles on a straight line add up to 180.

Angles inside a triangle add up to 180. This can be shown by tearing a triangle into 3 pieces, with a corner in each. Join the corners together to make a straight line. Because there are 180 on a straight line there must be 180 in a triangle.

  • An angle is an amount of turn measured in degrees.
  • Make sure you know this…


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