As with Lesson 1 in this module, students use simple materials to explore the relationship between different types of angles in circles. In Lesson 1, the exploration was limited to angles inscribed in diameters; in this lesson, the concept is extended to include all inscribed angles.
This lesson sets up concepts taught in Lessons 5–7. Problem 6 of the Problem Set is particularly important in setting up Lesson 5. Problem 7 of the Problem Set is an extension and is revisited in Lesson 7.
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