If the 6 is meant to be inches (= 1/2 ft.) then:
8 ft. x 24 ft. x 1/2 ft. = 96 cu.ft. concrete.
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11.852 cubic yards
12-ft x 12-ft x 2-in = 24 cubic feet = 8/9 of 1 cubic yard
55
4 square feet are needed
24+24+20+20=88 yards of fencing