## Geometry: Common Core (15th Edition)

csc $B = \frac{15}{12}$
If the secant ratio is the inverse of the cosine ratio, then we just reverse the sides in the cosine ratio to get the secant ratio. If sec $B$ = $\frac{adjacent}{hypotenuse}$, then: sec $B$ = $\frac{hypotenuse}{adjacent}$. . Let's look at angle $B$. The hypotenuse has a length of $15$, and the side adjacent to $B$ has a length of $12$. csc $B = \frac{15}{12}$