They are known as the three trigonometric ratios because they show how large one side is compared to the other based on an angle Ɵ. Practise trigonometric ratios in similar right angled triangles ...

An understanding of the three trigonometric ratios and how to change the subject of a formula is essential. The Greek letter, Ɵ (theta) is often used as a symbol for an unknown angle. For a right ...