Q.

[[1]] is a regular quadrilateral.


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Detailed Solution

Square is a regular quadrilateral.
In a regular quadrilateral all four equal sides and four equal angles.
As we know in a square, all the sides are of equal length and all angles are equal. We can see this in below figure also, ABCD is a square in which,
AB=BC=CD=DA A=B=C=D= 90 °  
Question ImageTherefore, the correct answer is square.
 
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