Let $U \subseteq \mathbb{C}$ be a D5008: Standard open complex set such that

(i)	$f : U \to \mathbb{C}$ is a D1392: Holomorphic function on $U$
(ii)	$T \subseteq \mathbb{C}$ is a D4996: Complex triangle
(iii)	\begin{equation} \text{int}(T) \subseteq U \end{equation}

Then \begin{equation} \int_T f(z) \, d z = 0 \end{equation}