Trigonometry
Discover all about Trigonometry in this section, from discovering the relationships themselves to practising the skills required.
Trigonometry (QQI)

Use this QQI activity to get get as much practice as you need on calclating with the trig ratios.

Use this activity to investigate the relationship between the side length of similar right angled triangles

Finding Lengths (GGB)

In this activity you can practice finding lengths using trig, and adjust the settings to get as many questions as you want!

These two videos give examples of how to use trigonometry to find the lengths of two missing sides of a right angled triangle, when you know an angle and one side.

This is a worked through example of how to use trigonometry to calculate the missing angles in a right angled triangle.

Sine Rule (Video)

Two worked examples and descriptions of how to use the Sine Rule, one showing how to find lengths and one showing how to find angles.

Cosine Rule (Video)

These two videos go through a worked example of using the Cosine Rule to find a missing length, and then another example to find a missing angle.

Sine and Cosine Rules (Video)

Two examples of how to use a mixture of the Sine Rule and Cosine Rule to find all the missing information for a given triangle.

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