Question
A triangular plot of land has sides 15 m, 20 m, and 25
m. Find its area and the cost of fencing it along all sides at Rs 80 per metreSolution
Check right angle: 15² + 20² = 225 + 400 = 625 = 25². So it is a right-angled triangle with perpendicular sides 15 m and 20 m. Area = (1/2) × base × height = (1/2) × 15 × 20 = 150 m² Perimeter = 15 + 20 + 25 = 60 m Cost of fencing = 60 × 80 = Rs 4800 Answer: Area = 150 m²; Fencing cost = Rs 4800.
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