Let radius of semi circle = $$r$$ cm => Perimeter of semi circle = $$pi r+2r=108$$ => $$r(frac{22}{7}+2)=108$$ => $$r(frac{22+14}{7})=108$$ => $$r=108 imesfrac{7}{36}=21$$ cm $$ herefore$$ Area of semi-circle = $$frac{1}{2} pi r^2$$ = $$frac{1}{2} imesfrac{22}{7} imes(21)^2$$ = $$11 imes21 imes3=693$$ $$cm^2$$ => Ans - (C)