This is sine, cosine, tangent, and our three sides of the triangle. If we take the horizontal ... This clip will be relevant for teaching Maths at KS3/GCSE in England Wales and Northern Ireland.

text{Area of a triangle} = \frac{1}{2} ab \sin{C}\) To calculate the area of any triangle the lengths of two sides and the angle in between are required. Rearrange the equation to make \(\sin{C}\) ...