Biogas offers multiple benefits for rural India:
1. Clean cooking fuel: Reduces dependency on firewood, minimizing indoor pollution.
2. Energy source: Provides electricity and fuel for small-scale applications.
3. Waste management: Utilizes agricultural and animal waste, reducing environmental pollution.
4. Bio-fertilizer: The slurry left after biogas production is an excellent organic fertilizer.
5. Cost-effective: Reduces energy costs and promotes self-reliance.
In the adjoining figure, \( AP = 1 \, \text{cm}, \ BP = 2 \, \text{cm}, \ AQ = 1.5 \, \text{cm}, \ AC = 4.5 \, \text{cm} \) Prove that \( \triangle APQ \sim \triangle ABC \).
Hence, find the length of \( PQ \), if \( BC = 3.6 \, \text{cm} \).