What you’ll learn3 learning objectivesChoose one objective for a focused lesson, or study the complete topic.12.1.1The radian and express angular displacement in radians• define the radian and express angular displacement in radiansSyllabus objective12.1.2The concept of angular speed• understand and use the concept of angular speedSyllabus objective12.1.3Ω = 2π / T and v = rω• recall and use ω = 2π / T and v = rωSyllabus objective