The trigonometric ratios sine, cosine and tangent are used to calculate angles and sides in right angled triangles. We are now going to extend trigonometry beyond right angled triangles and use it ...

The sides of right ... to sin. For a given angle Ɵ, sinƟ = opposite ÷ hypotenuse. This is written as a fraction. Image caption, The adjacent side divided by the hypotenuse for each triangle ...