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      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 metre
      A Area = 150 m²; Fencing cost = Rs 4800 Correct Answer Incorrect Answer
      B Area = 250 m²; Fencing cost = Rs 2800 Correct Answer Incorrect Answer
      C Area = 350 m²; Fencing cost = Rs 4870 Correct Answer Incorrect Answer
      D Area = 100 m²; Fencing cost = Rs 3808 Correct Answer Incorrect Answer

      Solution

      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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