Trigonometric ratios are ratios of sides of right-angled triangles, dependent on the angles in the triangle. To make use of these, we label the sides on a triangle with relation to an angle $\theta$:
The three primary ratios are sine, cosine, and tangent.
For a right-angled triangle with an angle θ:
Additionally, we can express $\tan\theta$ in terms of $\sin\theta$ and $\cos\theta$:
$$\tan\theta = \frac{\text{opposite}}{\text{adjacent}}$$
$$\tan\theta = \frac{\frac{\text{opposite}}{\text{hypotenuse}}}{\frac{\text{adjacent}}{\text{hypotenuse}}}$$
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