What you’ll learn2 learning objectivesChoose one objective for a focused lesson, or study the complete topic.1.4.1Radians• understand the definition of a radian, and use the relationship between radians and degreesSyllabus objective1.4.2Arc length and sector area• use the formulae sr= i and Ar 2 1 2= i in solving problems concerning the arc length and sector area of a circle. Including calculation of lengths and angles in triangles and areas of triangles.Syllabus objective