Using Common Content Knowledge to investigate solutions
The whole group was posed with the question about how one could prove that triangles 1
and 3 were the same size as 2 and 4 (see Fig. 2). Fatima quickly examined the task and
offered, “If you cut them each in half,” which spurred a discussion about creating eighths
and rotating to show that each of the fourths are composed of two congruent eighths. After