There are 2 semi circles.
One that is on left side ( say S1)and the other one at the bottom(say S2) of the figure. Both these semi circles have diameter 30.
perimeter of S1 = (2*pi*15)/2
perimeter of S2 = (2*pi*15)/2
There is another figure which is of a semicricle(say S3). The radius is 30.
Perimeter of S3 = (2*pi*30)/4
Required perimeter
= S2+ S3-S1
= [(15*pi)/2] + [(15*pi)]- [(15*pi)/2]
= (15*pi)
= (15*3.14)
= 47.1