If all sides of a quadrilateral are equal, it is a or .

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Detailed Solution

If all sides of a quadrilateral are equal, it is a rhombus or square.
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,

A B = B C = C D = D A ∠ A = ∠ B = ∠ C = ∠ D = 90 °

Also, rhombus has 4 sides that are all equal length and opposite angles are equal.
Question Image

In the above figure, MNOP is a rhombus in which opposite angles are equal.

∠ M = ∠ O ∠ P = ∠ N

Hence, the correct answer is square or rhombus.

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