A stork is carrying a baby to its parents. The stork is flying at a constant altitude of 200 meters, directly approaching a delivery point that's 500 meters away horizontally, and it's about to begin its descent down to the baby's new home. The stork, being a bird, is not worried about its distance or angle of descent -- but the baby's parents, watching from below as a large wading bird with a human baby in its beak approaches solid ground, are quite concerned about the logistics of this situation. They're wondering how far the bird is from them, and more importantly, the angle at which it will need to descend to deliver their newborn to them (figuring that a smoother descent will probably be better).

Try to picture this situation and imagine what the answers to the parents' questions might be. You might not be able to answer the concerned parents now, but at the end of this section, you'll have all the tools you need to put their minds at ease.