A) 8 cm
B) 56 cm
C) 7 cm
D) 21 cm
Correct Answer: C
Solution :
Perimeter = 56 cm Given length is three times its width. Let the width be x cm. Then length \[=3x\text{ }cm\] \[\therefore\] Perimeter \[=2(x+3x)=8x\,cm\] \[\Rightarrow\] \[8x=56\,\,\Rightarrow \,\,x=7\] \[\therefore\] Width \[=7\text{ }cm\]You need to login to perform this action.
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