In Lesson 3, students learn to copy and bisect an angle. As with Lessons 1 and 2, vocabulary and precision in language are essential to these next constructions. Of the two constructions, the angle bisection is the simpler of the two and is the first construction in the lesson.
Students watch a brief video clip to set the stage for the construction problem. Review the term bisect; ask if angles are the only figures that can be bisected. Discuss a method to test whether an angle bisector is really dividing an angle into two equal, adjacent angles. Help students connect the use of circles for this construction as they did for an equilateral triangle.
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