A) 30 cm
B) 60 cm
C) 72 cm
D) 132 cm
Correct Answer: B
Solution :
[b] Length of wire = Circumference of the circle with \[r=42\,cm\] \[=\left( 2\times \frac{22}{7}\times 42 \right)=264\,cm\] Let the length of rectangle be 6xcm. Then, its breadth = 5xcm \[\therefore\] \[2\,(6x+5x)=264\] \[\Rightarrow\] \[11x=132\] \[\Rightarrow\] \[x=12\,cm\] Smaller side of rectangle \[=(5\times 12)=60\,cm\] |
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