Chapter 11 - Section 11.3 - The Tangent Ratio and Other Ratios - Exercises - Page 520: 43

The angle of elevation is $72^{\circ}$

Let $\theta$ be the angle of elevation. We can find $\theta$: $cos ~\theta = \frac{10~ft}{32~ft}$ $\theta = cos^{-1}~(\frac{10~ft}{32~ft})$ $\theta = 72^{\circ}$ The angle of elevation is $72^{\circ}$