# Definition:Cosecant/Definition from Triangle

## Definition

In the above right triangle, we are concerned about the angle $\theta$.

The cosecant of $\angle \theta$ is defined as being $\dfrac{\text{Hypotenuse}} {\text{Opposite}}$.

## Also denoted as

The cosecant function:

$\csc$

can often be seen written as:

$\cosec$