図形と方程式１：三角形の面積公式となす角《一橋大1991年》

After filming this lesson, I decided to film the previous video, "Experience 2: Triangle Area Formula," so there's a lot of overlapping explanations. If you've watched the previous video, the captions inserted in the middle of this one probably aren't necessary, but I felt that this video might not have been clear enough for those taking the class for the first time, so I made the difficult decision to add captions. (I messed up right before the explanation where I needed to add the captions, so my mind was blank and I was thinking about re-recording from the beginning.) For now, I'll be uploading the remaining shapes and equations over the New Year holidays, so I appreciate your continued support.