4.2.2

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

1Number

1.1Using Numbers

1.2Fractions, Decimals & Percentages

1.3Powers & Roots

1.4Accuracy

2Algebra

2.1Introduction to Algebra

2.2Manipulating Algebra

2.3Proofs & Functions

2.4Straight Line Graphs

2.5Common Graphs

2.6Transformations & Tangents

2.7Properties of Graphs

2.8Solving Equations

2.9Inequalities

2.10Sequences

3Ratio

4Geometry

4.1Introduction to Geometry

4.2Triangles & Quadrilaterals

4.3Transformations

4.4Circle Basics

4.5Circle Theorems

4.6Measurements & Units

4.7Calculating Area

4.8Triangle Formulae

4.93D Shapes

4.10Vectors

5Probability

6Statistics

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