Discussion
How much area is required to plant 1600 trees at a spacing of 2.5 m × 2.5 m?
Answer: B
The area needed is about 2.5 acres.
At a spacing of 2.5 m × 2.5 m, each tree occupies 6.25 m2:
\[ \begin{aligned} \text{Area} &= 1600 \times 6.25 = 10000\ \text{m}^{2} \\ &= 1\ \text{hectare} \\ &= 2.47\ \text{acres} \end{aligned} \]
since one hectare is 2.471 acres (one acre is about 4,047 m2). This rounds to 2.5 acres. The larger figures of 3.5, 4.5 and 5.5 acres would correspond to wider spacing or more trees.
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