The sides of the triangular plot …
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Gaurav Seth 4 years, 3 months ago
Semi perimeter of the field (s) =(50+65+65)/2
= 180/2
= 90 cm
By heron's formula,
Area of the triangle = √s(s-a)(s-b)(s-c)
= √90(90-50)(90-65)(90-65)
= √90(40)(25)(25)
= √3600×25×25
= 60×5×5
= 300×5
= 1500m^2
Cost of laying grass = 1500×7
= ₹10500
1Thank You