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Q.

ABCD is a rhombus and P, Q, R and S are the mid-points of the sides AB, BC, CD and DA respectively. The quadrilateral PQRS is a rectangle. Is the given statement true or false?


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a

True

b

False 

answer is A.

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Detailed Solution

Given that, ABCD is a rhombus and P, Q, R and S are the mid-points of the sides AB, BC, CD and DA respectively. The quadrilateral PQRS is a rectangle
The following figure depicts the given situation:
Question ImageThe diagonals of the rhombus perpendicularly bisect each other.
AOD=DOC=COB=BOA= 90  
In ΔADC  , S is the midpoint of AD and R is the midpoint of DC. So, from midpoint theorem,
SR||AC and SR= 1 2 AC  ………. [1]
In ΔABC  , P is the midpoint of AB and Q is the midpoint of BC. So, from midpoint theorem,
PQ||AC and PQ= 1 2 AC  ………. [2]
From [1] and [2] we get,
PQ||SR and PQ=SR= 1 2 AC  
Similarly,
PS||QR and PS=QR= 1 2 BD  
Thus, we get that PQRS is a parallelogram.
Now, the corresponding angles when SR||AC is,
KON=SND= 90  .
From the figure linear pair is,
SNO=SND= 90  .
Thus, sum of interior angles on the same side of transversal is, SNO=KSN= 90   Hence, PSR= 90  .
A parallelogram with one of its angles as a right angle is a rectangle. Thus, PQRS is a rectangle. Hence, the statement is true.
Therefore, the correct option is 1.
 
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