## Algebra and Trigonometry 10th Edition

$height=19.67~ft$
The ladder is the hypotenuse of the right triangle. The height is the opposite side because $\theta=80°$ is the angle between the ladder and the ground. $sin~80°=\frac{opp}{hyp}=\frac{height}{20}$ $height=20~sin~80°=19.67$