## Precalculus (6th Edition) Blitzer

$529$ yards
The trigonometric ratios are as follows: $\tan \theta =\dfrac{opposite}{adjacent}$ Now, we have $\tan 40^{\circ} =\dfrac{a}{630}$ This gives: $a= 630 \times \tan 40^{\circ}$ Therefore, we have $a =529$ yards