Question

What does the perimeter of this figure consist of? semicircle = __ line segments = __

Answer 1

Remark
I'm just going to eave a very short note and if you answer quickly in the comments, I'll come back and edit the question.

Argument
If consists of 2 sides and 2 semicircles. Without a width, there is no number to be given. We can get a formula

Fomula
Perimeter = 2*sides + 2pi *w/2 
Perimeter = 2*13 + pi*W