How big was a medieval bow?
The medieval bow was a metre and a half long
Yes they did use bow and arrows. In regarding a medieval European knight, it would be very unusual for one of them to personally use a bow and arrow in warfare, or even in hunting. This is because the bow was considered a 'cowards' or 'commoners' weapon. Generally a knight would recruit - conscript would probably be a better word - peasants and similarly lowly people to shoot at other people for him.