Use this formula when given the sizes of two sides and its included angle.

👉 Learn how to evaluate the Sine of an angle using the half-angle formula. The half-angle formula for Sine is helpful when you need to determine the exact value of the function given an angle but ...

Learn how to solve for the lengths of the sides and the measures of the angles of a triangle using the law of cosines. The ...

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 to ...