The teacher has a long ladder 13 meters taken place to lean on the wall by wall, the ladder base apart 5 m would like to note that at the end of the stairs, another side of the floor is approximately how many meters.
Teacher expert with 13 meters long ladder placed across the base of the wall by the stairs to the wall at 5 meters, I know the other end of the ladder to a height of about a meter.
Teachers professional ladder 13 meters long Placed on the base wall ladder against the wall 5 meters apart I want to know that the ladder side high from the ground between a few meters.