triangle question
I am not sure what this triangle unit is called but it is 2 small triangles on one side with a large triangle on the other side. My question is- is there an easy way to trim these? I don't have a pattern & I am trying to trim them down to size but don't know where to put my diagonal lines to get a consistent size.
I am sure there has to be an easy way. Can anyone out there help me? Thanks.