40×40

40×40 denotes a two-dimensional size in which width and height are both 40 units. The × symbol is used to indicate the pairing of dimensions, and when the two measurements share the same unit, the result describes a square.

In mathematics, a square with side length 40 has an area of 40×40 = 1600 square units and a perimeter of 4×40 = 160 units. The notation is widely used to express simple, exact dimensions in a compact form.

In practical applications, 40×40 appears in several contexts. In digital imaging, a 40×40 image contains 1,600 pixels, useful for small icons, avatars, or thumbnails. In design, printing, textiles, and crafts, 40×40 can refer to physical dimensions such as 40 by 40 centimeters or inches, defining a square tile, fabric patch, or embroidery square. In mapping or grid-based systems, a 40×40 cell represents a square area on a grid, with each cell having equal width and height.

The notation is often written as 40×40 or spoken as “forty by forty.” When the units are clear, the expression describes a square shape; for non-square dimensions, the format may specify different values for width and height, such as 40×60.