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# Trigonometry

Free Resources

## 3D Trigonometry

To solve problems involving trigonomety in 3D shapes students are taught to identify 2D right-angled triangles a...
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Interactive Lessons

## Cosine Rule - Finding Angles

Students learn how to derive and apply the Cosine Rule to find missing angles in triangles.  As learning progres...
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Interactive Lessons

## Cosine Rule - Finding Lengths

Students learn how to derive and apply the Cosine rule to find missing lengths in triangles.  As learning progre...
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Interactive Lessons

## Exact Trigonometric Solutions

Students learn how to solve trigonometrical equations with exact solutions using special triangles.   As learnin...
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Interactive Lessons

## Pythagoras' Theorem - Finding the Hypotenuse

Students learn how to derive and apply Pythagoras' Theorem to find the hypotenuse of right-angled triangles.  A...
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Interactive Lessons

## Pythagoras' Theorem - Shorter Sides

Students learn how to calculate a shorter side of a right-angled triangle using Pythagoras' Theorem.  As learni...
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Interactive Lessons

## Introducing Pythagoras' Theorem

Students discover Pythagoras’ Theorem through construction of Pythagorean triples.  As learning progresses stude...
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Interactive Lessons

## Sine Rule

Students learn how to derive and apply the Sine rule to find missing angle in triangular shapes.  As learning pr...
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Interactive Lessons

## Trigonometry - Angles in Right-Angled Triangles

Students learn how to apply Sin, Cos and Tan to find missing angles in right-angled triangles.  As learning prog...
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Interactive Lessons

## Trigonometry - Area of Triangles

Students learn how to derive and apply the area formulae for non-right-angles.  As learning progresses they are ...
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Interactive Lessons

## Trigonometrical Graphs

Students learn how to plot and read from trigonometrical graphs between 0 to 360°.  As learning progresses they ...
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Interactive Lessons

## Trigonometry Introduction

Students discover the three trigonometric ratios Sin, Cos and Tan through constructions.  As learning progresses...