## Geometry: Common Core (15th Edition)

$36.9$
In this exercise, we are asked to find the measure of an unknown angle, given its cosine. cos $x$ = $\frac{12}{15}$ Take cos$^{-1}$ of each side to solve for $x$: $x$ = cos$^{-1}$$(\frac{12}{15})$ Evaluate to solve for $x$: $x \approx 36.9$