Diameter of the dartboard as given in the question = 18 inches Then Radius of the dartboard will be = 18/2 inches = 9 inches We already know that Circumference of a circle = <span>2π</span>r We also know that the value of <span>π = 3.14159 Then Circumference of the dartboard = 2 * 3.14159 * 9 inches = 56.548 inches = 56.55 inches So the radius of the dartboard is 9 inches and the circumference of the dartboard is 56.55 inches. I hope the procedure is absolutely clear to you. </span>
