MethodDivide into groups. Each group constructs one of 60°, 120°, 75°, 135°, 150° and 90°, then presents it to the class. Show your arcs. Do not rub them out, because the arcs are the proof that you constructed the angle rather than drew it.
Ask each group one questionWhich two angles did yours sit between, and how many times did you have to bisect? The 60 and 120 groups will answer none. Everyone else will answer once or twice. That answer is the real content of the lesson.
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