Which of the following formations is commonly used in drill competitions?

The line formation is commonly used in drill competitions because it allows for a high level of precision and visibility among participants. This formation enables the members of a group to present a unified front, showcasing discipline and coordination, which are critical elements in drill competitions. Line formations facilitate clear communication and movement, making it easier for participants to execute complex maneuvers while maintaining alignment and spacing. Additionally, this formation presents a solid visual impact to judges and audiences, highlighting the efforts and execution of the drill team.

Other formations like square, diagonal, and triangle may be used in specific contexts or for particular maneuvers, but the line formation is favored for its effectiveness in demonstrating teamwork and synchronized movements in competitive settings.