Angle

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

 

Angle formula
\( \theta \;=\;  l_a \;/\; r\)
Symbol	English	Metric
\( \theta \) = Angle	\(deg\)	\(rad\)
\( l_a \) = Arc Length	\( in\)	\( mm \)
\( r \) = Radius	\(in\)	\(mm\)

 

Angle formula
\( \theta \;=\; 2 \; A_{se} \;/\; r^2 \)
Symbol	English	Metric
\( \theta \) = Angle	\(deg\)	\(rad\)
\( A_{se} \) = Sector Area	\(in^2\)	\(mm^2\)
\( r \) = Radius	\(in\)	\(mm\)