2 Added substantiated information (answers should be more than a one-word suggestion)
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AnotherOne word that can be used is gathered.gathered:

The cheerleaders gathered to form a big triangle in front of the cheering crowd.

As a verb, gathered means:

gather (v.)

  • To congregate, or assemble.
    People gathered round as he began to tell his story.

  • To collect from different places; assemble.

  • To cause to come together; convene.

(Sources: Wiktionary, Wordnik)

Another word that can be used is gathered.

One word that can be used is gathered:

The cheerleaders gathered to form a big triangle in front of the cheering crowd.

As a verb, gathered means:

gather (v.)

  • To congregate, or assemble.
    People gathered round as he began to tell his story.

  • To collect from different places; assemble.

  • To cause to come together; convene.

(Sources: Wiktionary, Wordnik)

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Another word that can be used is gathered.