NCERT Example 2 - Heron's Formula
Question: A triangular park has sides 120 m, 80 m and 50 m. Find the area to be planted and the cost of fencing at ₹20 per metre, leaving a 3 m gate.
Answer: Area = 375√15 m²; cost of fencing = ₹4940.
Full step-by-step NCERT solution with diagrams on Something by Zero.