The correct option is C 36 cm
When the circular disc is divided into two equal parts, we get two semi-circular discs.
Now, the perimeter of each semi-circular disc thus obtained is given by
12× Perimeter of the circle + Diameter
[Since diameter of the circle will also be a part of the semi-circular disc]
Perimeter of the semi-circle
=12×2πr+2r
=πr+2r=r(π+2)
=7×(227+2)
=36 cm
Therefore, perimeter of each semi-circular disc is 36 cm.