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H. Solution of triangles using trigonometry, including the sine and cosine rules. H1: Triangles and trigonometry Understand the similarity of triangles, and use this to make geometric inferences; Right-angled triangles The sine, cosine and tangent functions. Trigonometry in right-angled triangles. H2: Solving triangles Find the size of an angle in a right-angled triangle. Find the length of a side of a right-angled triangle. Solve problems, including those involving bearings. Calculate the area of a triangle using ½a b sin C; H3: The sine and cosine rules Use the sine rule and cosine rule.