* Command Module (CM): This was the main part, housing the crew during the journey to and from the Moon. It was about 10.4 feet (3.17 meters) in diameter and 11.5 feet (3.5 meters) in height.
* Service Module (SM): This was attached to the Command Module and contained the engine, fuel, and other systems for the mission. It was about 12.8 feet (3.9 meters) in diameter and 29.5 feet (9 meters) in height.
* Lunar Module (LM): This was the lander that took the astronauts to the Moon's surface. It was about 33 feet (10 meters) in height when fully assembled, with a descent stage diameter of 13 feet (4 meters) and an ascent stage diameter of 10.7 feet (3.3 meters).
So, depending on what part of the Apollo 11 spacecraft you are referring to, the length will vary significantly.
