## Precalculus (6th Edition) Blitzer

$23$ yards
The trigonometric ratios are as follows: $\sin \theta= \dfrac{opposite}{hypotenuse}$ ; $\cos \theta= \dfrac{Adjacent}{hypotenuse}$ and $\tan \theta= \dfrac{Opposite}{Adjacent}$ The angle of elevation is: $\theta =37^{\circ}$ So, the height of the building $h= 30 \tan 37^{\circ}$ or, $h=22.6 \approx 23$ yards