A) ` 9500
B) ` 11000
C) ` 10500
D) ` 12500
Correct Answer: C
Solution :
Let sides of triangular field be a = 50 m, b = 65 m and c = 65 m Semi-perimeter of triangular field.\[s=\frac{a+b+c}{2}\] \[=\left( \frac{50+65+65}{2} \right)m=\frac{180}{2}m=90\,m\] Area of triangular field \[=\sqrt{90(90-50)(90-65)(90-65)}\,{{m}^{2}}\] \[=\sqrt{90\times 40\times 25}\,{{m}^{2}}=1500\,{{m}^{2}}\] \[\because \]Cost of laying grass in \[1\,{{m}^{2}}\]area = ` 7 \[\therefore \]Cost of laying grass in \[1500\,{{m}^{2}}\]area = ` \[(7\times 1500)=\]` 10500
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