A) \[378\,{{m}^{2}}\]
B) \[438\,{{m}^{2}}\]
C) \[786\,{{m}^{2}}\]
D) None of these
Correct Answer: A
Solution :
(a): Ungrazed area = Area of square ? 4(area of quadrants) \[={{(42)}^{2}}-4\times \frac{1}{4}\times \pi {{(21)}^{2}}={{(21)}^{2}}[4-\pi ]=378\,\,{{m}^{2}}\]
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