The shaded area on the Sandbox Diagram represents the 12-inch-wide by 1- foot-tall concrete walls.
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This is a method for finding the volume, in cubic feet, of the concrete walls:
• Find the area of the shaded region, known as the base of the
concrete walls.
• Multiply the area of the shaded region by the height of the wall.
Use this method to find the volume, in cubic feet, of the concrete walls.