A) \[840\,c{{m}^{2}}\]
B) \[1680\,c{{m}^{2}}\]
C) \[480\,c{{m}^{2}}\]
D) \[7844\,c{{m}^{2}}\]
Correct Answer: B
Solution :
\[s=\frac{25+25+14}{2}=32\,cm\] \[\therefore \]Area of 1 triangular piece \[=\sqrt{32\times 7\times 7\times 18}=168\,c{{m}^{2}}\] \[\therefore \]Total area of paper needed to make the hand \[fan=(168\times 10)\,c{{m}^{2}}=1680\,c{{m}^{2}}\]
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