Answer:
10
Explanation:
The diameter is 12 feet, so the circumference is 12π ≈ 12 × 3.14 = 37.68 feet.
The edging is sold in 4 foot lengths, so the number of pieces needed is:
37.68 ft / 4 ft = 9.42
Rounding up to the nearest whole number, the landscaper needs at least 10 pieces.