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To solve this convert all measurement to a yard or square yard basis: 3 inches is 0.083333333333 yard and 1500 square feet = 1500/9 = 166.6666666666667 square yards Thus the amount of mulch you need is 166.6666666666667*0.083333333333= 13.88888888883333 cubic yards. so you need to purchase 14 cubic yards of mulch for the job.
Area=Length*Width A=14 Inches*2 Inches A= 28 square inches or 28 in2
14 inches
14 inches in diameter
Circumference of 14 inch radius circle: 2*pi*14 = 28*pi inches or about 87.96 inches rounded to two decimal places