Per pinner: Bumbling Bees: Universal Poncho Pattern You could use two identical rectangles and join them end to side where "rectangle A" is the length as the image shows, plus the length of B on the image.Raverly has the pattern measurements for that
The magic loop method for circular knitting one of my favorite skills to teach. Not only is it easy to master, but it can actually save time and money, and perhaps even help you get a better fit in your hand knitted garments. Here is a handy
Knitting Tutorial: Joining Stitches In the Round with a neat, easy and invisible technique. Just make sure that your stitches are not twisted on the needles before joining. GOID Idea for joining in the round Should be a better join solution.