Mathematics: Analysis and Approaches · Topic 3: Geometry and trigonometry
SL3.2 — Trigonometry: right triangles, sine and cosine rules
Mathematics: Analysis and Approaches · SL / HL · syllabus-mapped notes
Right-angled trigonometry
Use sine, cosine and tangent ratios to find sides and angles in right-angled triangles.
The sine rule
Relate sides to the sines of their opposite angles in any triangle.
The cosine rule
Link three sides and one angle in any triangle.
Area of a triangle
Find the area from two sides and the included angle.