Revise trigonometric ratios of sine, cosine and tangent and calculate angles in right-angled triangles with ... Eduqas The sine rule ... Use the sine curve to calculate the obtuse angle. \(\sin{77 ...

The sine rule can be used to find an angle from 3 sides and an angle, or a side from 3 angles and a side. The cosine rule can find a side from 2 sides and the included angle, or an angle from 3 sides.