Why did artists of the renaissance rely on mathematical formulas?

1. the period of artistic history from about 1600-1750, when the highly ornamental, expressive style of art, literature, and music flourished in europe 4 medieval 2. the period of artistic history from about 1750-1820, characterized by orderliness 2 romantic 3. the period of artistic history before 1450, characterized by religious emphasis and themes 1 renaissance 4. the period of artistic history from about 1450-1600, when artistic style moved away religious themes to a more man-centered focus 6 twentieth century 5. the period of artistic history from about 1820-1900, characterized by a highly emotional, imaginative style 5 classical 6. the period of artistic history from about 1900-2000, with a style characterized by embracing new ideas and throwing off constraints 3 baroque

The house above has an overall emphasis. a. vertical b. horizontal c. diagonal

What art form gives a real-life feel in terms of overall visual appearance?