Question

a rectangle in which all sides are equal is called a

Answer 1

Hey friend, Harish here.

Here is your answer:

If the sides of the rectangle are equal then, it is know as a square.

We know that,  

Perimeter of square = 4 × side.

& Perimeter of Rectangle = 2 ( l + b )

 As Length = Breadth Then, Perimeter = 2 ( l + l) = 2 ( 2l ) = 4l.

It is of the same form Of the perimeter of the square.

And even area of the square will be similar to that.

The length of diagonals will become equal. And and all angles are 90 degrees.
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Hope my answer is helpful to you.
                                                              

Answer 2

a rectangle in which all sides are equal is called a square