If the diameter of a golf hole is 4.25 inches, what is the approximate circumference of the hole

Can someone me my sister? she is in third grade. 50 points and brainlist! ones that are not answered. plz and thx!

If you could answer these your a life saver

Afarmer has a large field that is x feet in length. he wants to fence in a rectangular section in the middle of the field , leaving a length of 100 feet of open field behind each end of the fenced rectangle.he also wants the width of the fenced-in space to be 100 feet less than its length. find the expressions to represent the length and width of the fenced section of the field