-- length = 10 cm -- width = 7 cm -- height = 3 cm.
-- The area of the top and bottom is (length x width) each.
-- The area of the left and right sides is (length x height) each.
-- The area of the front and back is (width x height) each.
There. I just laid out all the schmartz you need to answer this question. The rest is all simple arithmetic, and you're perfectly capable of turning the crank and getting the answer. You don't need anybody else to do that part for you.
Don't forget your units. The area of each flat face is (cm) times (cm), and that product will be some cm² , for area.
