I learned almost everything we learned in chapter 10. It was a very easy but something new to learn. I learned there are so many equations to find different things within the circle. There is so much within a circle that i could never imagine memorizing.

Drummers use circles in there life every day. Almost every drum is a circle and they have to know the circle to use it. They have to know where center is and how far away from edge it is. They make different sounds and need them to know where it is located.

Does anybody understand the hydraulic formula?