The bottom of a cuboid glass jar is a square with a circumference of 60 cm. Now pour 9 liters of water into the jar. What is the height of the water in the jar?

The bottom of a cuboid glass jar is a square with a circumference of 60 cm. Now pour 9 liters of water into the jar. What is the height of the water in the jar?

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Side length of bottom surface: 60 △ 4 = 15 (CM)
Bottom area: 15 × 15 = 225 (square centimeter) = 2.25 (square decimeter)
Water height: 9 △ 2.25 = 4 (decimeter)