## Before You Watch

This video is designed to refresh your memory of trigonometry and what it means.

It uses algebra to represent the various sides and angles of the triangle. So, if you’re not confident with the concept of algebra and how symbols represent certain values, watch Introduction to Algebra first, then come back.

## The Video

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## Now What?

The next step in your trigonometry journey is to watch Components of Vectors. This video demonstrates a specific application of trigonometry used in science and engineering, as well as giving sample questions that you’re likely to come across at university and beyond.

## But When I am Going to Use This

Right-angled triangles are common in construction, surveying and the application discussed in the Components of Vectors video, where things like forces, or movements, are broken down into perpendicular components. However, trigonometry also extends to non-right angled triangles through applications like the sine rule and the cosine rule, and to calculating the areas of triangles.

Moving beyond triangles, trigonometry is critical to the study of waves, such as radio waves. This is very important in fields such as wireless communication and quantum physics: for instance, mobile phone technology would be impossible without a method of breaking down a signal into a series of sines and cosines known as Fourier Analysis. Your GPS device also uses trigonometry to help you navigate using satellites.