Angles & Triangles

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Angles and Triangles

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Right-angled triangle

  • A right-angled triangle has one angle of 90°.
  • The long side opposite the right angle is called the hypotenuse.
  • Right angled triangles can be isosceles or scalene.
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Obtuse- or acute-angled

  • If a triangle contains an obtuse angle it is called an obtuse-angled triangle.
  • If it does not, it is an acute-angled triangle.

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



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