First you line up the yardstick at the base of the measuring object then you mark a line where the top meets and repeat this over and over till you get to the top but make sure to keep note of how many lines are on it and thats how to get the answer.
given s³ = 729 where s is the length of each side of the fish tank (which also happens to equal the height because all sides of a cube are equal length)
