Remember, $\sin(x)=\frac{\text{opposite}}{\text{hypotenuse}}$

$\cos(x)\ =\ \frac{\text{adjacent}}{\text{hypotenuse}}$

$\text{tan}(x)\ =\ \frac{\text{opposite}}{\text{adjacent}}$

This is the reciprocal of $\sin\left(θ\right)$.

This is the reciprocal of $\tan(θ)$.

What is $\sec(θ)$ the reciprocal of?