Lesson Study Video for Area of the Circle: Student Explains (7 of 7)

Start 43:24, length 1min. 29 secs.

He then calls another student (Iijima) to the board, who then show the two formulas are the same. This presentation elicits an "ah ha!" moment for some students.

The teacher’s goal is to extend the idea to other figures such as triangles which have been constructed by other students, but the class runs out of time, and he finishes by saying that they will continue the next day.

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