Area of Semicircular region is equal half the area of circular region
A=1/2 x 22/7 x r^2
77=1/2 x 22/7 x r^2
77 x 7= 11 x r^2
7 x 7=r x r
r= 7 cm
Perimeter of semicircular region = half the perimeter of circle + diameter of the circle
Perimeter of semicircular region = 1/2 x (2 x 22/7 x r) +2r
Perimeter of semicircular region = 11/7 x 7 + 2 x 7 = 11+14=25