The formula for circumference is pi(diameter) or 2 x pi x radius. So you have the diameter which is 4.25. Next step you need to do is multiply it with pi which is equal to 3.14. Your equation would be C= 3.14 x 4.25.
In , represents the vertical shift. The midline of the function is given by , because the parent function has a midline at . Therefore, the midline of the function is