u see a cuboid is also known as a rectangular prism.and the total surface area of a cuboid is given by 2((length*width)+(width*height)+(length*height)).here we have length=5 cm ,width=6 cm and height =2 cm.so total surface area=2*((5*6)+(6*2)+(5*2))sq.cm=2*(30+12+10)sq cm=(2*52)sq cm=104 sq.cm
note that * denotes multiplication .