A) \[12\,\,a\,\,cm\]
B) \[\text{6}\,\,a\,\,cm\]
C) \[\text{15}\,\,a\,\,cm\]
D) \[\text{8}\,\,a\,\,cm\]
Correct Answer: A
Solution :
Perimeter \[=3a+4a+5a=12a\]
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