1750 in England
William first used the symbol for parallel.
The degree symbol (°) is used to represent units of measurement for angles or temperature. It is commonly used to specify temperatures in weather forecasts or to indicate angles in geometry and navigation.
Pythagoras was the 1st person who used the pi symbol first
William Jones first used the pi symbol (π) in 1706
"why" is not a mathematical symbol.
The first time the symbol Pi was first used for Pi was in ancient Greece in their numbers. The symbol "π" was number 80 in Greece.
William Oughtred(1574-1660) was the first to use the symbol for parallel.
Pierre
The symbol √ for the square root was first used in print in 1525 inChristoph Rudolff's Coss, which was also the first to use the then-new signs '+' and '-'
there is no symbol, you just say angle A is adjacent to angle B
Pierre
Archimedes