Who was the architect of this design? Is this an example of a CAD? What did the image allow the architect to see?

How did brunelleschi solve his problem with the dome of the florence cathedral? a. he created an outer support shell. b. he created many layers of support within the dome. c. he created external supports for the dome. d. all of the above

The arrangement of the pitches in a piece of twelve tone music is called

Neon colours names?sorry if my english are bad