Step 1: Breakdown of costs in Municipal Solid Waste (MSW) management. In a typical centralized MSW management system, the major functional elements include: Collection and transport Biological treatment (e.g., composting) Thermal treatment (e.g., incineration) Disposal in a sanitary landfill Among these, collection and transport account for the highest cost due to the following reasons: Extensive labor and operational requirements. High fuel consumption for transport vehicles. Large-scale infrastructure required for collection.
Step 2: Compare costs of other components. Biological treatment: Less expensive than collection and transport, as it primarily involves local facilities.
Thermal treatment: Costly but less frequent in Tier I cities due to limited use of incineration plants.
Disposal in a sanitary landfill: Costly but less significant compared to collection and transport costs.
A regular dodecagon (12-sided regular polygon) is inscribed in a circle of radius \( r \) cm as shown in the figure. The side of the dodecagon is \( d \) cm. All the triangles (numbered 1 to 12 in the figure) are used to form squares of side \( r \) cm, and each numbered triangle is used only once to form a square. The number of squares that can be formed and the number of triangles required to form each square, respectively, are:
In the given figure, the numbers associated with the rectangle, triangle, and ellipse are 1, 2, and 3, respectively. Which one among the given options is the most appropriate combination of \( P \), \( Q \), and \( R \)?