Triangles and Angles

Test yourself

Types of Angle

There are 4 important types of angle:

Illustrative background for Right angleIllustrative background for Right angle ?? "content

Right angle

  • A right angle is an angle of 90° and is indicated by a square angle marker.
Illustrative background for Acute angleIllustrative background for Acute angle ?? "content

Acute angle

  • An acute angle is one that is less than 90°.
Illustrative background for Obtuse angleIllustrative background for Obtuse angle ?? "content

Obtuse angle

  • An obtuse angle is one that is greater than 90° but smaller than 180°.
Illustrative background for Reflex angleIllustrative background for Reflex angle ?? "content

Reflex angle

  • A reflex angle is greater than 180° but smaller than 360°.

Jump to other topics


1.1Place Value

1.2Factors & Multiples


1.4Fractions, Decimals & Percentages

1.5Growth & Decay

1.6Measurements & Units



3Ratio, Proportion & Rates of Change

4Geometry & Measures



Go student ad image

Unlock your full potential with GoStudent tutoring

  • Affordable 1:1 tutoring from the comfort of your home

  • Tutors are matched to your specific learning needs

  • 30+ school subjects covered

Book a free trial lesson