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MEP Jamaica: STRAND I UNIT 32 Angles, Circles and Tangents: Lesson Plans STRAND I: Geometry and Trigonometry UNIT 32: Angles, Circles and Tangents Lesson 32.2 Angles and Circles 1 CSEC Objective: angle geometry Lessons Aims: After this lesson, the student should be able to: i) understand and use angle geometry results for circles, chords, diameters and tangents. Prerequisite Knowledge: Angles and circles Key Vocabulary: chord, diameter, tangent Challenges: This builds on previous knowledge but will be a challenge for some students as they need to be familiar with many definitions and results. Teaching Notes: Refer back to students’ previous knowledge and use this as the starting point for new results. PowerPoints: PP32.2 Lesson Plans: Review homework Introduction to the definitions DS 32.3 or ST 32.2 Worked example DS 32.4 or ST32.2, WE1 Exercises ST 32.2, Q1 (some of) Review answers Worked example DS 32.5 or ST 32.2, WE2 or WE3 Exercises ST 32.2, Q3 Review answers Closing activity ST 32.2, Q4 Homework ST 32.2, Q5 and Q6 Relevant CSEC Questions: RT Q2, Q3, Q4 Glossary of Terms: CIMT and e-Learning Jamaica A chord is a line joining any two points on the circle. The perpendicular bisector is a second line that cuts a line in half and is at right angles to it. The perpendicular bisector of a chord is always a radius of the circle. A tangent is a line that just touches a circle. It is always perpendicular to the radius.