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Oak National Academy
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Trigonometry

Year 9 • Maths
We've put the lessons in order helping you build on what you've learned before so it’s best to start with the first lesson of a unit.

Choose a lesson (12)

1
Checking and securing understanding of similar triangles
2
Checking and securing understanding of Pythagoras' theorem
3
The unit circle
4
Scaling the right-angled triangle from the unit circle
5
Sine and cosine ratios
6
Tangent ratio
7
Using the sine ratio
8
Using the cosine ratio
9
Using the tangent ratio
10
Choosing the right trigonometric ratio
11
Choosing an appropriate method for finding lengths of a triangle
12
Problem solving with trigonometry