51. Find the volume of a pyramid with a square base, where the perimeter of the base is 15.8 ft and the height of the pyramid is 20.4 ft. Round your answer to the nearest tenth of a cubic foot.

1. Determine the side length of the square baseDivide the perimeter by 4: ft.2. Calculate the area of the baseUse the area formula for a square: sq ft.3. Calculate the volume of the pyramidApply the volume formula , where is the base area and is the height: cubic ft.4. Round to the nearest tenthRounding to the nearest tenth gives .