Hi, my name's Lincoln Ward. I'm the director of the Austin Tennis Center here in Austin, Texas. Today we're going to talk about finding the circumference of your tennis ball. Finding the circumference is a pretty easy task. There's a couple different ways you can go about it. If all you have is a ruler, you can find some piece of string or cord to wrap around the length...or the width of your tennis ball. Just wrap it around a circle, and then undo that string, and then put it up against your tape measure. If you happen to have a nice, old fashioned tape measure, like this one here, which I'm going to use today, you can just wrap it around a tennis ball, and, pull it nice and snug around the fattest portion of the tennis ball, and here we have it. Right at ten inches. So ten inches is the circumference of a tennis ball. I'm Lincoln Ward. Thank you.