Polygons

We've been studying Polygons this past days. When I first saw the shapes I'm actually familiar with it but not with their names :/ when we were assigned to write the no. of diagonal, no. of diagonal from a vertex, and no. of triangles , I actually did it manually that's why I had a hard time and I had to repeat it all over again every time I miscount one line and the time came when I knew the formula T_T too late I already answer everything without the formula but I checked it again and good thing I noticed my wrong answers so I had a chance to do it again (at home) . And I hope I can memorize all the names of each polygon and be familiar with it T_T


P.S- Getting to nervous for our coming test . =_= AJA!