What are the dimensions of a standard indoor volleyball court?

The dimensions of a standard indoor volleyball court are indeed 18 meters long and 9 meters wide. This configuration adheres to the official regulations set by the Fédération Internationale de Volleyball (FIVB), which is crucial for ensuring uniformity in competitive play across various levels of the game.

Having a court of this size allows for optimal play dynamics, maintaining adequate space for player movement, strategic positioning, and the execution of volleyball skills such as serving, attacking, and defending. The dimensions also cater to the rules governing the service area and the attack line, heightening the tactical elements of the game.

The other dimensions provided are incorrect as they do not align with official standards. For instance, the options with lengths of 12, 15, and 20 meters, or with widths of 6 or 10 meters, would not provide the necessary area for the various plays and strategies utilized in volleyball, potentially leading to a compromised playing experience and gameplay that does not meet competitive standards.