rectangular? Well, let’s see our fr

rectangular? Well, let’s see our friend’s. At first, our friend cut it like this. How many channels are there? There are six channels.
According to the Episode in Item 393-398 as the above, in Item 393, the teacher asks the students to explain why do they get six channels the same. The student explain picture (d) as Item 394, (cross the picture. Then paint it). The gesture is iconic. As the Item 398, the teacher shows the Group’s per-formance for their friends to consider again. According to the above Episode, it could be seen that the student uses gesture in concise messages in Mathematical Communication. So, the participants have common understanding. It could be concluded that it is Economically Mathematical Communication by stu-dent’s iconic gestures