18. What is the equivalent of 1 inch in centimeter?
a. 25 centimeters
b. 1.27 centimeters
c. 1.905 centimeters
d. 2.54 centimeters
19. Are concepts used to organize or arrange the structural elements of design.
a. Principles of design
b. Emphasis
c. Color Theory
d. Primary Colors horources of all colors even though there are thousands and​