Thank you guys for the quick responses. And thank you for the link, only i still don't understand fully. I have drawn the 3 isomers of dichloroethylene. But in my book when we went over molecular geometry it doesn't mention anything about flat. It tells us linear, trigonal planar, tetrahedral, triagonal pyramidal, and bent. But maybe the answer is flat, and our teacher is just throwing us a curveball.