In our exploration of the shape tools, we started with the Rectangle tool.
We can not only create rectangle using Rectangle tool but we can also create a perfect square or any desired shape using the rectangle tool.
Choose Rectangle Tool. Click and drag with the CTRL key pressed down to constrain the rectangle to a square. You can also hold down the SHIFT key to have the rectangle drawn from the center out, rather than the top left corner, or use both the CTRL key and the SHIFT key together to create a square drawn from the center.