You can get even fancier. Construct a parallelogram by entering typing the following sequence of commands into the input box:[br][br] A = (1,1)[br] B = (4,5)[br] l = line[A,B][br] C = (7,5)[br] m = line[C,l][br] n = line[B,C][br] o = line[A,n][br] D = intersect[m,o][br] polygon[A,B,C,D][br][br]Additional commands you can use: ShowAxes[ <Boolean> ], ShowGrid[ <Boolean> ],