An open box with base 14 cm by 18 cm and height 9 cm (external dimensions) is constructed with all four sides and the bottom 2 cm thick. What is the total surface area of this box in square cm?
+128406 Here....I'm assuming that the base of the box is contained within the sides of the box rather than the sides sitting on top of the base.....
The surface of the bottom is 2 (14 * 18) = 504 cm^2
The inside of the box has the surface area of 2 (14 * 7 + 18 * 7 ) = 448cm^2
The outside of the box has the surface are of 2 (14*9 + 18*9) = 576 cm^2
So....the total surface area is
[ 504 + 448 + 576 ] cm^2 = 1528 cm^2
