Answer :

Given sides of triangle a= 26 m, b = 28m, c = 30m


(i) Since the grass has to be planted within the area of triangular field we will calculate area of the triangular field


Area =


Where s is the semi perimeter of triangle and a, b, c are the sides of the triangle



s = 42 cm


Area =


=


=


=336 m2


Cost of planting grass = area of triangular field × rate per sq meter


= 336 × 5


= Rs1680


(ii) Since the fencing is to done on the edges, we will calculate the perimeter of triangular field


Perimeter of triangular field = 26 + 28+30


= 84cm


Since 5 meter space has to be left for entrance gate construction


So the total perimeter to be fenced = 84-5 = 79cm


Cost of fencing the triangular field = perimeter of the field to be fenced × rate of fencing per meter


Cost of fencing = 79 × 18


= Rs 1422


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