The midpoint of the line segment AB with the length of 12cm is m, and the line segment MB is divided into MC: CB = 1:2 by point C. Then how many cm is the length of the line segment AC
AC =AM +MC =1/2AB+MC=6+1/6AB=6+2=8cm
AC =AM +MC =1/2AB+MC=6+1/6AB=6+2=8cm