This section reviews various ways of measuring angles. We introduce and emphasise a unit of measurement which you may not have seen before (the radian), but which is convenient in situations where we want simple relations between lengths and angles.
1. Read the Study Notes and Discussion for this module, and make sure that you have absorbed the main points by answering the questions.
2. Read section 5.1 of the text.
4. Follow the instructions regarding Further Practice until you have achieved the Learning Objectives for this section.