\(\sin \alpha = \dfrac yr = \dfrac {\text{depan}}{\text{miring}}\)
\(\cos \alpha = \dfrac xr = \dfrac {\text{samping}}{\text{miring}}\)
\(\tan \alpha = \dfrac yx = \dfrac {\text{depan}}{\text{samping}}\)
\(\sec \alpha = \dfrac {1}{\cos \alpha} \)
\(\csc \alpha = \dfrac {1}{\sin \alpha} \)
\(\cot \alpha = \dfrac {1}{\tan \alpha} \)