Question 112
Three sides of a triangular 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 5 rupees per sq.m.
Solution
Sides of triangle are 15,20,25 m
Since, $$15^2 + 20^2 = 225+400 = 625 = 25^2$$
=> The given sides are of right angled triangle.
=> Area of triangular field = $$\frac{1}{2} * 15*20 = 150 m^2$$
=> Cost of sowing seeds = 5 * 150 = Rs. 750
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