Question

The length of a rectangular park is twice its breadth and its perimeter is 840 m. Find the area of the park.

Answer 1

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`