## Elementary Geometry for College Students (6th Edition)

cos α = $\frac{12}{13}$ = 0.92 cos β = $\frac{5}{13}$ = 0.38
cos α = $\frac{length of adjacent}{length of hypotenuse}$ cos α = $\frac{12}{13}$ = 0.92 Similarly cos β = $\frac{length of adjacent}{length of hypotenuse}$ = $\frac{5}{13}$ = 0.38