Trigonometry in all triangles The sine rule and cosine rule can be used with any triangle, including right-angled triangles. You should know how to use the sine rule and the cosine rule. You should know when to apply the sine rule and when to apply the cosine rule. Sine rule a/sinA = b/sinB = c/sinC […]
Trigonometry and Right-angled Triangles You should know how to use the trigonometric ratios (sine, cosine and tangent) in order to solve problems with right-angled triangles. Hypotenuse – the longest side of a right-angled triangle, it is always the side opposite the right-angle Opposite – the side opposite the known angle or the angle […]