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Transformation is a common pen. When we use the dividers, it just needs two steps, and then we can begin to make a circle after measuring the circles round radius. Furthermore, its easy to change the pencil lead. The action is just like that we rotate the pen point, then put in the new pencil lead.
Shin Chien University
Taipei City, Taiwan
Chun Wen / WANG
Yi Li / CHANG
Yen Chang / CHIU