A city park is designing a decorative walkway around a flower bed. The walkway is shaped like a semi-circular ring, as shown below. The outer edge has a diameter of \(13\) \(cm\). The walkway has a uniform width of \(4\) \(cm\) throughout, as shown in the figure. The gardener wants to place a decorative border along the entire boundary of the walkway.
Based on this, find the solutions for the following.
(i) What is the radius of the outer semicircle? \(cm\)
(ii) What is the radius of the inner semicircle? \(cm\)
(iii) Find the total length of the two straight edges. \(cm\)
(iv) Calculate the total length of the decorative border required (the perimeter of the walkway). \(cm\)
[use \(\pi= 3.14\)]