Yellow and Purple

Green and Red

Blue and Orange

These colors are opposite of each other on a color wheel.

Since the basic color wheel contains only the primary colors of red, yellow, and blue, the red and blue are complementary as they are opposite each other. However there are also other color wheels that contain shades and hues of these primary colors.  In the case in which the shades and hues are used, the complementary colors are those that are opposite each other such as reds and greens, oranges and blues.

 Complimentary colors are shades/hues that are opposite from each other on the color wheel.  For example, green and red are complimentary colors, as well as orange and blue, yellow and purple.