Confusion in Determinant of a Product

At around 1:55 in the video, the transformation is blown up by a factor of 3. However, the coordinates of the projection don’t seem to be correct.
coursera01
I tried to create the transformed image using the plugin, and this is what I get


Do I understand it wrong, or is there an error in the material?

Hi!

Thanks for flagging this issue. You are correct, the slide image is misleading. It should be as it is being shown in the plugin. I will request the fix to our team.

Thanks!
Lucas

Hello, the same is true for the green parallelogram.

image