A) \[10\sqrt{2}\,c{{m}^{2}}\]
B) \[200\sqrt{2}\,c{{m}^{2}}\]
C) \[100\,c{{m}^{2}}\]
D) \[200\,c{{m}^{2}}\]
Correct Answer: B
Solution :
(b): \[S=\frac{20+30+20}{2}=40\,\,\,S=\frac{20+30+30}{2}=40\] \[\therefore \,\,\sqrt{40\times 20\times 10\times 10}=\sqrt{8}\times \sqrt{10000}=\sqrt{8}\times 100\] \[=200\sqrt{2}\]
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