9. A system where the trees are planted at the corners of an equilateral triangle. a. Contour system b. Hexagonal system c. Quincunx system d. Square system
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Answer:
B. Hexagonal system
Explanation:
the trees are planted in the corners of equilateral triangles. Six trees thus form a hexagon with another tree at its centre. This system, though a little difficult for execution but accommodates 15 percent more plants.