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Question
The length of a rectangular park is twice its breadth and its perimeter is 840 m. Find the area of the park.
Solution
Let the breadth of the rectangular park be b.
∴ Length of the rectangular park`=l=2b`
Perimeter = 840 m
⇒`840=2(l+b)`
⇒`840=2(2b+b)`
⇒`840=2(3b)`
⇒`840=6b`
⇒b=140 m`
Thus, we have:
`l=2b`
=`2xx140`
=`280m`
Area `lxxb`
=`280xx140`
=`39200 m^2`
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