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Q.

In the given figure, if parallelogram ABCD   and rectangle ABFE are of equal area, then find the relation of their perimeters.


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a

Perimeter ABCD<  perimeter ABFE

b

Perimeter ABCD>  perimeter ABFE

c

Perimeter ABCD=  perimeter ABFE

d

None of the above 

answer is B.

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Detailed Solution

Given, a parallelogram ABCD and rectangle ABEF having equal area and has same base.
Question ImageNow In ΔAED   And ΔBFC  
  AE=BF [Opposite sides of parallelogram] AD=BC [Opposite sides of parallelogram] AED=BFC [Both are right angles.]  
 Thus, ΔAEDΔBFC  . [By SAS test]
  DE=FC   [CPCT]
Again ΔAED   is a right angle.
 So, AD is the hypotenuse AD>AE  
 Now, from the figure we can say that, FE=FD+DE   DC=DF+FC DC=FD+DE  (as DE=FC) DC=EF  [ DE=FC   ]
Since AD>AE, perimeter ABCD>  perimeter ABFE.
Hence, the correct option is 2.
 
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