A) \[42\sqrt{2}\,cm\]
B) \[45\sqrt{3\,}\,cm\]
C) \[52\sqrt{2}\,cm\]
D) \[54\sqrt{3}\,cm\]
Correct Answer: D
Solution :
[d] Side of an equilateral triangle \[=\frac{2}{\sqrt{3}}(l+m+n)\] \[=\frac{2}{\sqrt{3}}(6+9+12)=18\sqrt{3}\] \[\therefore \]Perimeter of a triangle \[=3\times 18\sqrt{3}=54\sqrt{3}\,cm\] |
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