Angle

An angle, abbreviated as \(\:A\:\), \(\:\theta\:\) or \(\:\angle\:\), is formed by two lines having a common point or vertex.

 

Angle formulas
\(\large{ \theta = \frac{ l_a }{ r }   }\)  \(\large{ \theta = \frac{ 2 \; A_{se} }{ r^2 }   }\)
Symbol	English	Metric
\(\large{ \theta }\) = angle	\(\large{deg}\)	\(\large{rad}\)
\(\large{ l_a }\) = arc length	\(\large{ in}\)	\(\large{ mm }\)
\(\large{ r }\) = radius	\(\large{in}\)	\(\large{mm}\)
\(\large{ A_{se} }\) = sector area	\(\large{in^2}\)	\(\large{mm^2}\)