What did the greeks use to establish the ideal proportions in the human body, architecture, and other forms of art

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Which statement is true? select one: a. all art created in florence during the renaissance was commissioned by the medici family. b. without wealthy patrons, it is likely that many italian renaissance works would not have been created. c. religion was the driving force behind works created by leonardo and michelangelo. d. the public was responsible for determining whether an artwork was great.

What are these signs and what do they mean ?