A cuboid glass tank, the bottom is a square with a circumference of 60 cm, now pour 9 liters of water into the tank, how high is the water in the tank?

A cuboid glass tank, the bottom is a square with a circumference of 60 cm, now pour 9 liters of water into the tank, how high is the water in the tank?

1 liter = 1 cubic decimeter 9 liter = 9 cubic decimeter = 9000 cubic centimeter
The side length of a square is 60 / 4 = 15 cm
The ground area is 15 * 15 = 225 square centimeters
The water height in the cylinder is 9000 / 225 = 40 cm