O LEVEL MATHEMATICS · TRIGONOMETRY
Learn how to study right-angled triangles, choose the correct ratio and solve side and angle problems with confidence.
Start LearningFollow the lessons in order and use the repeated How to Solve It template.
Understand right triangles and label their sides correctly.
Open Lesson →Choose sine, cosine or tangent from the information in the triangle.
Open Lesson →Use trigonometric ratios to calculate unknown side lengths.
Open Lesson →Use inverse trigonometric functions to calculate acute angles.
Open Lesson →Learn how to select the correct method before calculating.
Open Lesson →Use right triangles to analyse distances and directions.
Open Lesson →Turn real situations into labelled right triangles.
Open Lesson →Solve non-right triangles using opposite side-angle pairs.
Open Lesson →Solve triangles using SAS or SSS information.
Open Lesson →Work confidently with obtuse angles and angle notation.
Open Lesson →Find hidden lengths and angles by breaking solids into triangles.
Open Lesson →Choose and combine the correct methods independently.
Open Lesson →Complete an exam-style assessment covering the full topic.
Open Lesson →