The area of a rectangle is 343 m2 and its length is 7 times its breadth. What is the perimeter of the rectangle?
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → 112 m
Area of a rectangle \(=\) length \(\times\) breadth, and perimeter \(=2(\)length \(+\) breadth\()\).
Let the breadth be \(b\) m; then the length is \(7b\) m
\(7b\times b=343\), so \(b^2=49\) and \(b=7\) m
Length \(=7\times7=49\) m
Perimeter \(=2(49+7)=112\) m