this is my 10th year teaching middle school math, and i have enjoyed each one of them. these are the kinds of things a good life is made of. we can precisely address the energy loss problem and recommend a cost effective solution. the time was finally right and that i was ready to write this book. "a" stands for arbitrary -- just the name of the shape that's familiar to most of us. portrait mode will allow you to do precisely that. if you need your order in a hurry, please use the contact us section to let us know. 