Landscaping Design Class

Tonight we have our third landscaping design class. I am totally lost. We were issued our architectural rulers, triangles and circular templates. We were given our homework to draw garden beds and determine the size and placement of vegetation. Hubby and I worked on the homework together for a while and then he decided he needed to take a shower and start dinner. Fortunately it is a very large class and we will not likely volunteer for anything. Tomorrow we are in a class on roses at a local nursery. I am trying awfully hard not to let my brain go dormant.