Renaissance architecture emerged in Europe from 14th to 17th centuries. Filippo Brunelleschi is considered the founding father of Renaissance architecture. Style emerged as a reaction to Gothic architecture's individuality
Direct proportion means constant ratio between two quantities. Symbol is ∝, written as "x is directly proportional to y". William Emerson introduced the symbol in 1768
Ratio compares two quantities using colon ':'. Ratios can be written as x:y, x/y, or x to y. Ratios must have same type and units. Ratios can be part-to-part or part-to-whole
Proportional sequences have constant ratios called coefficient of proportionality. Inverse proportional sequences have constant products called coefficient of proportionality. Proportionality extends to related varying quantities called variables
Ratio compares two numbers using colon (:). Ratios can be written as fractions (e.g., 8/12) or as "to". Order matters when comparing ratios