SP001 Maths Paper 2 - Question 15

Peter used some wire to create the figure as shown.
There were 2 identical wire structures and they were joined with a piece of wire CD.
Each wire structure was formed by a large semi-circle, a small semi-circle and 2 straight lines.

a) What is the radius of a small semi-circle?
b) What is the length of wire for making the figure?
(Take $\pi = 3.14$)

Ans: a) ______________$cm$ [2]
b) ______________$cm$ [2]