Find The Cost of Sowing Seeds in The Field at The Rate of Rs. 5 per sq. m.

Three sides of a triangle field are of length 15 m, 20 m  and 25 m long, respectively. Find the cost of sowing seeds in the field at the rate of Rs. 5 per sq. m.

  1. 750
  2. 150
  3. 300
  4. 600
Anurag Mishra Professor Asked on 1st August 2015 in Maths.
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    Best answer

    Answer: (1) 750
    Explanation:-
    In triangle PQR,
    PR2 = PQ2 + QR2
    252 = 152 + 202
    625 = 225 + 400
    625 = 625
    Therefore, the triangular field is right angle at Q.
    Then, Area of the field = = PQ x RS/2
    = 15 x 20/2
    = 150 m2
    Therefore, the cost of showing seed is Rs.5 sq. m
    Thus, the cost of sowing seed for 150 m2 = 150 x 5 = Rs.750.

    Anurag Mishra Professor Answered on 1st August 2015.
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