1. Introducing Trigonometry

2. 30 º Hypotenuse Adjacent Opposite

3. We use 3 functions Sine or SIN Cosine or COS Tangent or TAN

4. Investigation To find a relationship between the 3 functions and the ratios of the lengths of a right angled triangle.

5. TriangleHypotenuseOppositeO / HAngle xSin x 1 2 3 4 5

6. TriangleHypotenuseOppositeO / HAngle xSin x 110 5 0.5 30 0.5 2 3 4 5

7. 53.2 º Hypotenuse Adjacent Opposite

8. TriangleHypotenuseAdjacent A / HAngle xCos x 1 2 3 4 5

9. Sin X = O / H Cos X= A / H Tan X = O / A