4.2.1

Types of Triangle

Test yourself

Types of Triangle

There are three types of triangle: equilateral, isosceles and scalene.

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Equilateral

  • An equilateral triangle has all angles 60° and all sides the same length.
  • It has rotational symmetry of order 3 and 3 lines of symmetry.
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Isosceles

  • An isosceles triangle has two sides the same length and two angles the same.
  • There is one line of symmetry.
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Scalene

  • A scalene triangle has all sides different lengths and all angles different sizes.

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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