Question

Find tan(theta) if the terminal side is intersecting the unit circle at (-5/13, 12/13).

Answer 1

notice the picture and the terminal point

notice the adjacent side and opposite side, or cosine and sine

bear in mind that $\bf tan(\theta)=\cfrac{opposite}{adjacent} =\cfrac{y}{x} =\cfrac{sin(\theta)}{cos(\theta)}$