As shown in the figure, given point C is the midpoint of line ab. D is any point on line AC. m and N are the midpoint of ad DB respectively. If AC = 16, find the length of Mn We must complete the whole process

As shown in the figure, given point C is the midpoint of line ab. D is any point on line AC. m and N are the midpoint of ad DB respectively. If AC = 16, find the length of Mn We must complete the whole process

MN=(AD/2)+(BD/2)=(AD+BD)/2=(AB)/2=(2*AC)/2=AC=16