area of yellow sector inside circle=144*pi/8=56.54862 sq cm
therefore area of both sectors= 113.09724 sq cm
area outside the circle= 144-113.09724 = 30.90276 sq cm
thus yellow area outside circle = 15.45138 sq cm
hence whole yellow area= 56.54862+15.45138=72 sq cm
without calculations
since white area and yellow area are same each=0.5*144=72 sq cm