4.1.4

Triangles & Angles

Test yourself

Types of Angle

There are 4 important types of angle:

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Right angle

  • A right angle is an angle of 90° and is indicated by a square angle marker.
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Acute angle

  • An acute angle is one that is less than 90°.
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Obtuse angle

  • An obtuse angle is one that is greater than 90° but smaller than 180°.
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Reflex angle

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

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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