What are the fundamental techniques used to achieve
perspective?

Explanation:

Three basic types of perspective -- one-point, two-point, and three-point -- refer to the number of vanishing points used to create the perspective illusion

wait i don't understand this, but my guess is that this is a trick question.

a chromatic scale uses the twelve tones of the octave, while a regular scale only uses eight, or seven different notes (as the first note is played twice)