Re: HELP
Well, if your three points (vertices) of your triangle are A, E, and B. And you give us the lengths: AD = 20 inches, DC = 30 inches, and AC=34 inches, without a diagram of the triangle, it's hard to figure out the perimeter. Furthermore, it would make more sense if you told us the triangle was ACD, or ADC, in which case the lengths you supplied us with would be more pertinent to the vertices you gave us. See?
If the triangle was ADC or ACD, you would just add up the lengths (of the three sides) which you already know and their sum would be the perimeter of the triangle.