Hello, all. I'm trying to help my daughter who has Geometry in high school. I've had to relearn a lot! We're unable to understand how to get the height, which according to the answer sheet, is 4. Another student helped her but unfortunately she didn't make sure she understood the reason. All she wrote down was 8*10=80. I know this would be the area of the shape if you draw a line down the top right corner of the parallelogram (b*h). Then they wrote 80=20*h. Solving for h is 4, but we don't understand how 80 is also the area of the shape containing h. Please help me understand what I'm missing. Thank you in advance.