Which colors are defined as four colors that are equidistant along the color wheel?

The concept of colors being equidistant along the color wheel is best represented by the term "Tetradic colors." Tetradic color harmony involves four colors that are evenly spaced around the color wheel, forming a rectangle or a square. This arrangement creates a vibrant color scheme that can add depth and variety to design.

In a tetradic scheme, two complementary pairs of colors provide a full range of hues, enhancing visual interest and balance when used in architecture and design. The key characteristic of tetradic colors is their systematic distribution around the color wheel, ensuring that when they are combined, the composition remains visually pleasing while allowing for dynamic contrasts.

Other options represent different color relationships. For instance, triadic colors are derived from three colors that are equidistant from one another, forming a triangle on the color wheel, but do not encompass four colors. Complementary colors consist of two colors directly opposite each other on the color wheel, providing high contrast but not addressing four distinct colors. Square colors typically refer to a color arrangement involving two complementary pairs but is less commonly used than the term "tetradic." Thus, it is the tetradic definition that most accurately describes four colors equidistant along the color wheel.