## Elementary Geometry for College Students (5th Edition)

$d \approx 8.1$ units
1. Use the cosine ratio to find $d$ Recall that CAH: $cos = \frac{adjacent}{hypotenuse}$ $cos(36) = \frac{d}{10}$ $d = 10cos(36)$ by GDC / calculator $d = 8.09016...$ units $d \approx 8.1$ units