Which statement correctly describes the base distance for a 40-foot ladder from the wall?

• A. The base should be at least 10 feet from the wall
• B. The base should be at least 5 feet from the wall
• C. The base should be at least 15 feet from the wall
• D. The base should be flush against the wall

Answer: (A)

Safe ladder setup uses the 4:1 rule: for every four feet of ladder height, the base should be about one foot from the wall. A 40-foot ladder therefore needs a base roughly 10 feet from the wall to reach a safe, stable angle around 75 degrees. Saying the base should be at least 10 feet communicates this minimum distance you should maintain to avoid placing the ladder too close (which would make it too steep and unstable) or too far (which compromises reach and stability). Being flush against the wall isn't practical for safe use, and distances like 5 or 15 feet pull the ladder away from this ideal angle. So the base should be at least 10 feet from the wall.