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Since the perimeter of the base is 66 feet and one side is 18 feet, we can calculate the length of the missing side by subtracting the given side length from the perimeter.
Perimeter = 2*(missing side length) + 2*(18 feet)
66 feet = 2*(missing side length) + 36 feet
30 feet = 2*(missing side length)
15 feet = missing side length
So, the length of the missing side of the base is 15 feet.
To calculate the volume of the pyramid, we need to know the height of the pyramid. If the height is given, we can use the formula V = (1/3)*Base Area*Height to find the volume.