Students learn how to calculate unknown lengths in right-angled triangles using Sin, Cos and Tan. As learning progresses they are challenged to apply other facts about triangles to solve more complex problems.

**Differentiated Learning Objectives**

- All students should be able to calculate the length of a right angled triangle using the Sine and Cosine functions.
- Most students should be able to calculate the length of a right angled triangle using the Sine, Cosine and Tangent functions.
- Some students should be able to calculate the length of a polygon edge by considering its right-angled triangular components.

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