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Year 9 Interactive Maths - Second Edition

Chapter 15 Trigonometry

Trigonometry is the study of the relationships between the sides and the angles of triangles, principally right-angled triangles. It is used in solving problems that involve distances and angles. Toolmakers, fitters and many others need to be familiar with triangles and be able to calculate an angle or side-length of a triangle.

Naming the Sides of a Right-Angled Triangle
Finding Side-Lengths
Using the Cosine Ratio
Using the Tangent Ratio
Using a Graphics Calculator
Finding Angles
Using Inverse Cosine
Using Inverse Tangent
Problem Solving
Problem Solving Unit
Projects
Symbols
Index

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