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2.25 yd.3 but you should get at least 2.75 to 3 cubic yards so you don't run out.

Area of circle= 3.14 x r2, 6 in.=0.5 dec. ft., 27 cu. ft. = 1 cu. yd.

3.14 ft x 6ft2 x 0.5 ft = 56.52 ft3 then 56.52 ft3/27ft3 =2.09 yd3 (then round to nearest quarter of a yard) = 2.25 yds3

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