Why are red and cyan called complementary colors?

Related questions

1. Do purple and teal go together?
2. Is magenta pink or purple?
3. What is the difference between turquoise and cyan?
4. What Colour does purple match with?
5. What happens when you mix cyan magenta and yellow?
6. Is cyan a cool color?
7. Is turquoise green or blue?
8. Do green and purple go together?
9. Does cyan and magenta make blue?
10. Why the sun looks red before sunrise and sunset?

Tags

1. #atmosphere
2. #light
3. #bluish
4. #complementary
5. #together
6. #large
7. #called
8. #scatter
9. #create
10. #wavelength
11. #added
12. #longer
13. #white
14. #colors
15. #particles
16. #mountains
17. #distant